High roller like this usually undergo KYC due to the amount he is wagering if the account is a legit player. You can’t freely use the Casino and bet that huge amount without complying on the AML as this is stated in the law that’s why Casino ToS indicates that they may apply KYC to any user in any circumstances besides this whale is obviously used to submit KYC especially when he is withdrawing his asset to fiat from exchange. It’s so hard to avoid KYC this time when you have that huge amount. That’s the least thing he needs to worry.
Yes, I immediately thought of KYC when I read this news. There is no chance of "anonymous" playing with that amount of money. It turns out that someone with many millions of dollars is fully verified in a crypto casino and prefers blockchain betting using cryptocurrencies. This is good news for everyone who believes in cryptocurrencies and their further widespread adoption.
Amazing that someone with 20BTC verified his online casino account which some people are not willing to do it. He must have a great trust to this casino. If I have that amount and willing to gamble it all, I would prefer to go to a real casino and play there. This might depend to where he is from but aren't winnings from casino subjected to tax?
There are numerous justifications for wagering such this big amount of money. The first thing that comes to mind is that he is being greedy? The second reason is that he believes he is extremely fortunate today and is confident that he will win, and the third reason is that he is in debt and wishes to recover all of the money that he borrowed to pay it. Well, this is the most obvious reason that came to mind, but I haven't seen a single bet that is as large as this one, and I don't pay much attention to other people's bets because I get jealous when they are betting more than I am and tempted to bet even more.
What if the bet was a regular one or average on all this user's bet? I don't think it can be called greediness. Being fortunate or lucky for the day is what people thinks in the first place that they want to risks huge amount but I think there might be a reason you haven't included like this user is some kind of a gambler that take huge risks or a real life billionaire, something like that.
Billionaires often don't mind where to spend their money. It only becomes a habit to spend on something even when they don't really need it. He could just be enjoying his money like Elon Musk spends billions on twitter shares, he didn't even join the board member meeting.