I haven't heard of online platform blocking there customers account over a win. I think most online casino dont required kyc. and its possible that it can be a trap of swindling people money when there is a big win. Its possible though.
You must be new here buddy! Most online casinos require KYC these days. Stake.com was KYC-free back then and required KYC on request. But now, they need KYC prior to signing up. 95 percent of casinos ask for KYC verification these days. If you haven't seen casinos blocking users accounts after a big win, feel free to check scam accusation board. There are no casino who haven't faced such allegations. If any casino want to scam their players, at first, they freeze user withdrawals and limit their bet amount and then start to investigate if player violated any kind of rules. If they didn't violate any rules, they ask players for KYC verification. Most of the times casino blames players of violating rules once users win big amount of money.
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It turns out that the casino makes money not only on players who lose over a long distance, but also on the fact that players are likely to return to them with a win only to lose it. So they also freeze the user’s winnings. Considering all this, they earn very well. But if we look from the other side, before we play we must make sure that we aren't violating any rules of this casino, and it is definitely better to go through the KYC before playing. But even if you don’t break the rules, sometimes I see topics created in which players accuse the casino of unfair play. I think that large casinos will not risk their reputation for this. In general, I think that a lot of people don’t read the rules, even I’m too lazy to read them sometimes. Maybe then we deserve such an attitude towards us, because in the beginning we also treated the rules.