I have reached their customer support and got replies like this.

So, they are still saying there is no need to pass KYC if you play with crypto. Again saying if they need they can ask for it. So as I can understand normally they don't ask kyc for the crypto users unless the user has any suspicious activity. The same as other crypto casinos.
"suspicious activity" means nothing. For them "suspicious" is everyone that is winning. I dared them to prove me if my device have been used with them before and they have not replied
if you want a more detailed answers try posting this on casino.guru or askgambelrs, they do try and help gamblers that have an issue with a gambling site. I am not sure if doing this would resolve the issue but there is no harm in trying.
I asked them on email if they have found any suspicious activity from me other than winning approx 100 euro. I asked if my IP or device was used on other accounts. They just do not want to pay, is that simple
have they responded to you? would you mind posting screenshots of the emails you've sent and received here?