MalteseFalcon also won the number 1 spot on the $1 000 000 race last month, wagering the most money on the site. This earned him $250 000 for the first prize.

I really think someone with that amount of money, should be able to "hide" his real identity to protect himself.
Stake will reach out to him/her to verify the account, because they have to protect their license by adhering to the KYC requirements, but I think only a select amount of people will have access to his/her details.
It is only money laundering once a person starts pushing money through a casino and withdrawing it on a regular basis.

I guess if he is forced to, he could leave for somewhere else so they might be pausing it as much as possible. I am not saying that they should not do a KYC for him, but at the same time I do understand why they would postpone something like that.
I don't know if anyone here went to a real casino, surely there must be some but there could be a few that wasn't near any real one as well both of those type people could be here, but for those who never went to a real life casino or don't know what kind of bets there are; MalteseFalcon would have been a HUGE high roller in any casino, and I mean like if went to most famous Las Vegas casino out there, he would still be a huge high roller, highest suite gifted, all foods drinks shows everything gifted, anything he wants bought and brought to him, dude would have spent zero dollars aside from gambling.