So if they cant able to have that level 2 verification by 31 of this month then the only option they could have is to make out some withdrawal of their funds inside of their casino account.
It would really be that up to them whether they would be finding another place to play or bet on but to know that Stakes reputation on which it wont really be giving out some doubts for
someone to make out some verification basing up on the credibility and popularity of the said site. So it will really be up to your choice.
I feel that they might extend that particular date soon since some gamblers might not be aware of these new rules and could miss the deadline. They will definitely lose some players though since many gamblers detest KYC with a passion.
However, the loss will probably not affect them in a big way thanks to their overwhelming popularity in the crypto space.