It does not mean they are scammer or including such rules to scam you in future. They only require higher KYC (if they are not scammers) if they detect suspicious things from your account (cheating, same pattern of betting big and win big, etc.) or money laundering on their platform. In my opinion, if you are good user, you can surpass their additional KYC requirement.
Anyway, always remember, not your keys not your coins and KYC is dangerous, on any platform.
- Why KYC is extremely dangerous – and useless
- You should be aware of it but sometimes, you have to accept KYC to use a platform you like.