I think the best approach is to look at several security layers rather than relying on one feature. SkyCrown Casino at https://skycrownaustralia.org/ provides account verification options and uses KYC procedures, which are particularly relevant when financial transactions are involved. I also prefer using a unique password for every gambling account instead of recycling one from other services. Another thing I check is whether the casino explains its privacy and verification procedures clearly. Transparent security information gives me much more confidence than vague claims about being “safe”.
Account security isn't something I used to think much about when playing online, but now I pay more attention to it. A strong password is obviously important, although I also want a casino to have sensible verification procedures and clear information about protecting player accounts. Email confirmation, phone verification and KYC checks seem to serve different purposes. What security measures do you usually look for before trusting an online casino with your personal details and payment information?