I've done another research just about a week ago, which got very positive feedback from the community but action still hasn't been taken against all the users I've found and accused. Here comes a second research of something different: this time it's not a referral spam but even worse: spamming a scam.
At this point, I think I can consider myself the little detective of BitcoinTalk!

I first wanted to publish in their active thread this entire post, but then decided to create my own thread so there could be a history record for their ongoing scam.
This is a scam accusation against btc2xreturn, crypto2double, eecbitcoin, xrpdoubler and btc2double. The websites almost identical, only some very small details have been changed. The main idea is, all websites are operating this scam.

First of all, they've created a thread for btc2xreturn in the Investor-based games board, this user (Shaunq) pretending to be their customer leaving a positive review and very excited to receive the double of their balance.

According to the archived 2018 version of btc2xreturn, 9498 BTC has been allegedly paid out by them to the investors. It's 2020 and the same amount shows up:

2018:
image loading...

2020:

~~It's literally the same crap. Would be fun if a programmer could take a quick look over the following script I found on btc2xreturn, "":~~ (edit: not needed anymore. I think the entire thread serves enough proof)

Code:

$(document).ready(function(){
/*Mudanças PHP BD*/
$('.item_type').css('text-transform','capitalize');
/*FIM Mudanças PHP BD*/

var JSONItems = [];
function refresh_table(){
console.log("start");
$.ajax({
url: './data.php',
method: 'GET',
success: function(data) {
JSONItems = JSON.parse(data);

var i;
var rand_number;
var type_def;
var raw_amount;
var dep_amount;
var td_string = '';
var counter = 0;
var addr;
for (i = 0; i < JSONItems["txs"].length; i++) {
if(((JSONItems["txs"][i]).out[0]).addr === undefined){
//console.log(JSONItems["txs"][i].out);
for(var j=0; j<(JSONItems["txs"][i].out).length; j++){

if(JSONItems["txs"][i].out[j].addr !== undefined){
addr = JSONItems["txs"][i].out[j].addr;
console.log("attrv");
break;
}
}
}

if(addr == null || addr === undefined){
continue;
}
raw_amount = (((JSONItems["txs"][i]).out[0]).value)/100000000;
dep_amount = Math.round((raw_amount + Number.EPSILON) * 100) / 100;

//console.log("t"+dep_amount);
if(dep_amount>5 || dep_amount<0.02){
console.log("c");
continue;
}
//console.log(JSONItems["txs"][i]);
rand_number = Math.floor((Math.random() * 10) + 1);
type_def = ((rand_number % 2 === 0) ? 'payout' : 'deposit');

td_string += '' + type_def + '';
td_string += ''+toDateTime(JSONItems["txs"][i].time)+'';
td_string += ''+addr+'';
td_string += ''+dep_amount/2+' BTC

';
td_string += '08:00:00';
td_string += ''+dep_amount+' BTC

';
td_string += '';

counter++;
if(counter === 10){
break;
}
}

if(counter >= 5){
$("#space tbody tr").remove();
$("#space tbody").append(td_string);
$('#space tr td').css('text-transform','capitalize');
}

//console.log(td_string);
},
error: function()
{
console.log("erro");
},
})
}

//setInterval(refresh_table(),1800000);
});

function toDateTime(secs) {
var t = new Date(1970, 0, 1); // Epoch

t.setSeconds(secs);

return t.toLocaleDateString('en-US') + ' ' + t.toLocaleTimeString('en-US');
}

Then, according to btc2xreturn, their business address is "1-5 High st, ox1 4ab, Oxford, United Kingdom". I'm waiting for a street view image from them pointing to the exact location of their business, because I'm sure a business having worked with ~$100M should have a decent office. The only business I can find at the location their website shows is Lloyds Bank.

In the thread Shaunq has created, there are other users leaving positive reviews for the website. All of them are Newbies and their only posts are answers to Shaunq and btc2xreturn shills. Here are the users:

Let's do some research and prove these accounts, together with Shaunq, are just spammers and shills of this scam.

Every single one of these users are posting with one line in between sentences. Like come on, this cannot be a coincidence. (edit: I wanted to provide more proof that they're alts, but the rest of the thread is enough imo.. they've all got the same writing style anyway.)

Quote from: DartsExpert on December 13, 2018, 01:19:16 PM

Hello,

I'm a new member here and as requested i'm giving my honest review about them.

I'm investing with them for some time and they are very professional and trusted.
snip

Quote from: BTCneedhelp1 on January 07, 2020, 05:37:33 PM

Received the money back.

As promised, all my posts have been deleted.

I request to all people who replied to my posts, delete my text or delete the posts.
snip

Quote from: CryptoEldder on February 10, 2020, 09:26:28 AM

As an older member of Btc2xreturn i received an invitation too. Seems like they are open to public again! Cool

Made an investment few hours ago, i should receive a payment very soon. I will update once i receive. thx

EDIT:
snip

Quote from: ballejordan on February 02, 2018, 05:59:37 PM

I invested many times on btc2double and all were success, today made another deposit of 0.1 BTC 5 hours ago and received now a payout of 0.2 BTC!!

My address where i got my payout: https://blockchain.info/de/address/34oUVYNe8sKRrRgyT9C7MpG1n48c1fCsTa

I'm so fuckiiing happy right now!! Grin

snip

Now let's go further in. These users have all posted in Shaunq's thread, right? Well, guess what - they've also posted in BTC2Double's thread. A quick Google Images search of "BTC2Double scam" results in these images, confirming the fact that BTC2Double is ALSO part of this scam. I went through BTC2Double's thread (which was edited to link to the newest scam website) and the following users are added to my list of alts of this scam (if you check their posts, they're ONLY spamming with fake transactions to create credibility..):

To further prove my point, ballejordan's first post was on January 22, 2018 in the BTC2Double thread. "Coincidentally" (obviously not), 11 months later his last post was on December 14, 2018 in the BTC2XReturn thread.
They have also bought (or hacked) a Sr Member account here to present credibility on the forum. The hacked/bought member is memphixx. Taking a look over his last posts is enough to notice the gap of activity and the sudden shill of this scam.

I swear to God, this scam is so deeply rooted in BitcoinTalk. The more I research, the more I find.... Just found that they've also created an XRP Doubler website.

They even held an ICO for DDF (Digital Developers Fund).
They've hosted a fake giveaway..
They also tried doing a fake signature campaign to promote the scam.
Another try: paying users with high number of followers to promote their scam

Some of their victims:

They're even plagiarizing:

Quote from: jason.morgan5 on December 27, 2017, 01:30:31 AM

This thread is a copy of the BTC2Double.com official thread: https://bitcointalk.org/index.php?topic=2488822.0

This site is SCAM and will steal your Bitcoins. Do not deposit in this scam site.

The only and legit site that is actually paying can be found here: https://bitcointalk.org/index.php?topic=2488822.0

Quote from: x2bitcom on December 27, 2017, 01:50:30 AM

This thread is a copy of the x2bit.com official thread: https://bitcointalk.org/index.php?topic=2650285.0

This site is SCAM and will steal your Bitcoins. Do not deposit in this scam site.

The only and legit site that is actually paying can be found here: https://bitcointalk.org/index.php?topic=2650285.0

To finally end this thread, I would like to request a ban for all these shills of the Bitcoin/Ripple/whatever other doubling service scam I've posted above. They've been ongoing for years and they just started being active on the forum again, which means this scam's roots will just develop more and more.

Excuse any mistakes in the thread. This was a pain in the a$$ to research.

I am aware that the existing rules of the forum may not be enough to ban these users. If that is the case, I would like to kindly ask the staff to take this case as an exception, because I think we all can agree that this is not something we want to live on BitcoinTalk.