First thing I see is "CAN I WITHDRAW MY WINNINGS WITHOUT ANY HASSEL?" and then check KYC rules and lastly this might be a vey unpopular opinion but I like to see the UI of website because if i am willing to loss my money in there atleast make it visually appealing so it doesn't look so bad after all.
to find our those qualities then you must play in crypto reputable casinos and which can be found ? here in forum mate as we have been advertising so many legit casino some may experience issues but the important part is that they are handling with care to remain their players doing it.
and also always check reputation and scam section to look on what the standing of each casinos.