I usually don't place much credit on "similar" registration dates (depending on how you define it), but in some instances it can certainly act as a piece of the puzzle, so I'll give credit where its due.
Generally speaking, the weight of similar registration dates shouldn't be enough to "convict" somebody of being an alt on their own, as a lot of harmless accounts can get caught in the crossfire. It should be used to add credence to a pre-existing theory.
So let's break it down in terms of what is correct usage of this as evidence vs. what is not.
from the OP's list of those they identified this simple list of the UID's involved shows their various creation dates / last active dates:
2012-11-21, 06:21:20 Date Registered: MAbtc
2013-07-09, 18:43:52 Date Registered: illyiller
2013-07-09, 18:49:13 Date Registered: figmentofmyass
2013-10-28, 00:34:01 Date Registered: exstasie
2013-11-18, 04:37:55 Date Registered: squatter
2013-11-18, 06:41:48 Date Registered: marky89
2014-07-27, 20:08:36 Date Registered: manchester93
2014-07-27, 20:20:46 Date Registered: romani245
2014-07-27, 20:31:48 Date Registered: illinest
2019-11-09, 08:23:27 Last Active: marky89
2020-01-15, 05:50:16 Last Active: MAbtc
2020-02-19, 17:55:53 Last Active: romani245
2021-02-02, 08:33:27 Last Active: exstasie
2020-03-05, 07:53:32 Last Active: manchester93
2020-03-05, 07:53:48 Last Active: illinest
2021-01-19, 20:49:35 Last Active: illyiller
2021-01-27, 10:33:45 Last Active: squatter
2021-01-30, 03:01:58 Last Active: figmentofmyass
Here we can clearly see 3 sets of accounts registered just minutes or hours apart. We already
know suspect they're alts and the registration dates of at least 7 of these accounts pretty clearly adds to that theory. We also know there's a good chance he created these accounts specifically for the purpose of gaming the forum, and he's likely not coming back under them.
Here's where things start to get a little off the rails:
Were @darkstar_ to compile a list (indeed *any* Campaign Manager) something like that would stand out like a sore thumb.
While doing this may yield interesting results further worth pursuing, it's a great way to get a lot of innocents caught up in the crossfire and suspecting people of being alts on this criteria alone is a bad idea.
So, here are the UID's I said are alts ways back in 2017:
2011-05-30, 19:00:03 Date Registered: dabest1
2012-07-13, 18:56:47 Date Registered: Fuckbuddies
2013-07-11, 20:33:34Date Registered: fildza
2013-07-26, 11:21:21 Date Registered: Wipeout2097
2013-08-10, 12:58:55 Date Registered: Kyle91
2013-09-13, 02:37:29 Date Registered: drpepperyummy
2013-09-24, 01:15:27 Date Registered: ltiv
2013-10-26, 23:51:06 Date Registered: beegatewood
2013-10-28, 00:34:01 Date Registered: exstasie
2013-10-29, 01:01:20 Date Registered: mert1337
2013-10-29, 05:35:27 Date Registered: Xtrem999
2013-10-30, 19:49:21 Date Registered: Leezil
2013-10-31, 15:04:09Date Registered: BioBTC
2013-11-01, 11:50:23 Date Registered: Jochen
[/quote]
OK so now you're literally declaring people alts who have registered up to 15 months apart. Even between 10-26 and 11-01, how many accounts do you think were registered in that time period? Hundreds, at least.
I see you also connected them for shilling the same ICO (didn't look into it), so it could very well be they are bought accounts that are part of a farm, but again I think you run the risk of involving too many innocents on these two things alone.
This I disagree with entirely, and I'll explain why:
[quote author=Timelord2067 link=topic=5313637.msg56312248#msg56312248 date=1612938909]
...
2013-10-26, 23:51:06 Date Registered: beegatewood[/color]
[color=red]2013-10-28, 00:34:01 Date Registered: exstasie[/color]
[color=orange]2013-10-29, 01:01:20 Date Registered: mert1337
2013-10-29, 05:35:27 Date Registered: Xtrem999
[color=teal]2013-10-30, 12:33:31 Date Registered: gentlemand[/color]
2013-10-30, 19:49:21 Date Registered: Leezil
2013-10-31, 15:04:09Date Registered: BioBTC
2013-11-01, 11:50:23 Date Registered: Jochen
...
[/quote]
This is exactly why you can't use registration date as your only piece of evidence for connecting alts. FOMA lives somewhere in the pacific northwest would be my guess, as his 3 biggest accounts post from that timezone (I didn't check the inactives). He's either American or Canadian whereas gentlemand is British through and through. It took me a minute to find this example and I'm sure there's hundreds of others:
[quote author=gentlemand link=topic=5296089.msg55746357#msg55746357 date=1607043152]
...
In this day and age forums are on their way out unless already established. People do Facebook groups and IM stuff like Telegram or Discord. I think it's an unfortunate development as all that info effectively [b]vapourises[/b].
...
[/quote]
Americans spell the word "vaporizes."
You'd be hard pressed to find any FOMA-connected account who spells things British. Actually it's a challenge and I'll award 25 merits to someone who finds an example that proves me wrong.
[quote author=mikeywith link=topic=5313637.msg56316941#msg56316941 date=1612985472]
imagine if someone wants to connect your account to an alt, they can easily send you funds from the address they use for another signature campain
[/quote]
If somebody randomly sends me bitcoin to my sig campaign / staked address, I suppose I'll have to learn to deal with the consequences.