Hehehe...jokes a part, email is still a standard for casino that didn't market itself as a no-KYC casino. The tricky part is that they made the registration hassle free, not knowing the email would be speedily be asked for in the near future. And yes, prepare your documentations when it is bigger, otherwise, leave while you still can. We always have options. More tricky, customers don't know where the big threshold starts.
Is there really a threshold to this? I dont think there should even be a threshold and most of all, a big one. It all just means, they arent cool with you withdrawing your winnings or even winning big. For some users, the registration point is where some might decide if they wish to own an account at certain casinos or not so, you would expect a hassle free one often.
Well, judging by the ToS on the 1win website, their AML policy seems quite standard for the gambling industry. Basically, they explicitly state that they may refuse to process a users transaction at any time and request identity verification if they have any suspicions. I think that, just like on other gambling platforms, KYC verification may be requested for any withdrawal amount, not necessarily a large one.
Its whats obtainable almost everywhere, I find it quite regular and of very good standard for most casino that are reputable. Once your account is flagged by their system, it cant prompt a KYC verification and it doesnt necessarily has to do with winning huge or making huge withdrawals.