The big advantage is of course that it is relatively anonymous, apart from the KYC. You can deposit as much money as you want, there is no one to check or view a transaction and possibly put it on pause as banks often like to do. And it also goes very fast, you can gamble fairly quickly on the site after an upgrade. And for a payout it is of course exactly the same story. Anonymity could also be a disadvantage if you have problems with a casino.
If there is a KYC, it's not anymore anonymous but what do you mean precisely by saying it could also be a disadvantage if you have problems with a casino? All cryptocasinos are offshore casinos, even russian ones like the one you are promoting, then I don't really understand what giving your identity will change if there is a concern. It usually only depends on the good will of the casino, they only care of their reputation and their need to keep or attract good customers. You will never been able to bring them to justice.