Bonuses and contests can indeed be a powerful way to attract the attention of gamblers, but not all casinos that provide bonuses or contests can be successful because casinos are also a determinant of success such as bonuses and contests if the one holding it is a small casino that does not have a high reputation or trust then it is unlikely that many gamblers will be interested.
If they keep providing instant withdrawals and no KYC they won't have problem attracting players. The only thing I'd worry about is a possible money laundering accusations towards the casino. That's why casinos often restrict people from certain countries like the US because the US likes to sue businesses that allow Americans to play without KYC. Sooner or later they will start blocking your site and trying to get to you. For now it's fine because you don't have enough money coming through to show up on their radar.
I play Fairspin, they allow making deposits in crypto, without commission. Plus, they have a lot of casino activities. I am participating in the tournament now, where I collect tokens that are given when you're placing bets. I have every chance to compete for a big prize, as much as $200k are on the line.
Is this a thread about Fairspin?