With the tags on your account? i think the casino has the right asking you about KYC and other supporting documents.
If the tag reason causes the OP to have to kyc, I think that's overkill, tags are not one of the reasons for kyc, many parties outside this forum are registering on casino/gambling sites, not on the basis of tags, it doesn't make sense to me.
There are several things gambling sites / online casinos that implement kyc.
1. Players cheat multi-accounts when betting.
2. The casino is deliberately unwilling to pay for the winnings and bonuses, the reason for not paying the winning participants is that they are looking for tricks to avoid getting paid.
OP, have you contacted the casino and said what happened to your money, my message in the future is to play on a responsible and honest gambling/casino site, Thus you are safe and protected from fraud, the reputation of the casino is very important.