Even i agree to you.

That's for most of the Investment Bots.

Some offer 1% daily and some 200% in 10 days.

But they never provide the details of how they are giving profits, or where they are sending the investments.

And for any spam bots with their ponzy schemes, they tarket the investors to keep making investments, till their target amount, and then run away.

But in the case of Crypto Lottery.

There is no need to deposit a large amount for purchasing and winning the lottery.

As if the lottery ticket cost is 0.00005 BTC, and you are willing to but 2 tickets, then it doesn't make any sense depositing more than 0.00010 BTC.

Hence at any point in time, you can make deposits of only that much amount which is required to buy the tickets. As as soon as the winner is announced by the Lucky Draw Algorithm, the winning amount is credited in the main balance. And once you have amount in main balance, you can withdraw without any restriction.

Taking As an Example

Now Generally Speaking, if a company wants to start a Similar Bot, then what will be the Monthly Cost.
1. Cost for Server
2. Cost for Licence Softwares.
3. Cost for Support.
4. Cost for Development.

Approximately more than 700 USD per month.

So if the company want to scam, he must have a target to get at least 1000USD of investor's fund. Because scamming for 500USD will make no sense if the monthy expenditures are 700USD.

Now we assume Crypto Lottery has 1000 active users participating in a lottery with 1 ticket each

Hence the total amount with the company for the sold tickets at any point of time will be 0.00005 x 1000 = 0.05 BTC which is aprox. 470 USD

So assuming Crypto Lottery as a scam is not making any sense logically.

And Crypto Lottery is taking 20% from the prize pool for the expenditure to run the service.

The BTC ticket Cost is only 0.00005 BTC, so you can decide yourself if really its a scam or a True OPEN Lottery.