Obviously, the more a casino is trusted, the more people (specially high rollers) feel save enough to deposit the bulk of their money intended to gamble and bet.
That being said, I do not personally have the numbers on the volume of the main Bitcoin casinos which are prefered by our community, though ,I am pretty sure Stake is definitely in the top 3 of the most trusted casinos of this forum. Sometimes, I take a look at the history section of Stake to see how much others users wager and I can see thousands of dollars behind put per a single dice roll or slot spin. That is a sign people who uses Stake do not fear their money would be seized for no reason and also a sign of the legitimacy of the service. Though, Stake is not the only one, there are other which I am sure can also show off such big volume, I am just not sure in what position they would be in.
Actually, there are many trusted crypto gambling sites that we can recommend to newbies in this forum who also want to gamble. Stakescom, Duelbits, Rollbit, Trustdice, BcGames, LiveCasino, Fortunejack, and others that have existed for a long time on this forum platform will not disappear here.
Now, I won't mention the others; it's up to OP to do research; after all, there are many people who gave him here that he can play with, and it's up to OP to decide which one he wants to gamble with.