At least the gambler are being informed at first that the site requires KYC and its up to them if they will continue or not.
True. This is why so many gamblers shifted to other sites where they didn't require to submit KYC at the beginning itself.
Despite of this issue Roobet remains stable and still operating good, their marketing strategy can cover this issues.
I believe their promotions makes gambler stay and that's a good indication of a good site. KYC will always be an issue to others especially this is a crypto gambling site where being anonymous still matters to others.