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Not only this but online gambling could be hugely risky as well. For example, let's say you have won a big amount online, but now the casino is not paying. They block the account and deny withdrawals. This is why we see a lot of scam accusations every day online. Online casinos ask for KYC verifications and many more which is extremely risky. There are chance of getting hacked too.
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.