Great discussion, guys. This is a good theme to cover as many newcomers are hesitating. I do the following, if I have doubts, I invest the smallest possible amount to my balance and play. Next, I withdraw money from it. This is a practical way to check. However, the drawback here is that I lose the welcome bonus (there is no reason to claim it with the minor deposit amount).
I think that this is a good way, but unfortunately when you operate with small amounts, there may not be any special problems. However, if you began to constantly use some kind of casino and suddenly won a large amount that you are going to withdraw to your account, then unexpected problems may arise for you. For example, you will be required to have KYC, which you did not do when you started using the casino, or some other form of identity verification. These unexpected "surprises" often spoil all the fun of the game, forcing players to engage in stupid correspondence with support.
Only those who did not read ToS when creating an account, those who just place a tick and click next face these "unexpected surprises". Nowadays, with every big purchase or win, people should be ready to pass KYC.
When I choose a place to gamble, first thing I do is checking their reputation in different internet sources. I dont care if casino offer bonuses, have promotional programs, gifts, huge number of game providers and etc. For me, most important is, if I win I want to receive my reward fair.