I bet on bitgame. It is easy and smooth but I got some usdt by stacking lut tokens. But the bitgame platform did not allow them to withdraw. they Introduced the law of minimum 100 $ valid bet for withdrawal. I don't think it's fair. Because in this way people are forced to bet there. Which is an annoying thing. I think everyone there should be given his freedom. Then they will be able to get more users.
Somewhat I agree, this similar like locking your funds in lending platform in order getting few %APY or dividend. The reason why casino offer their own token is to make people using their token, but they don't want to gave the dividend easily as it need minimum $100 bet first. It's better if the casino charge some fees rather than betting requirement, it's just like wager requirement for bonus money.
Probably you'd better looking for other sites that offer such interest/dividend.