How can we say that even a reputable gambling website won't cheat its users? we don't know because the system isn't transparent. So definitely, there are part of this that cheating really occurs sometimes on reputable or non-reputable platforms and we aren't aware of that.
Even if we don't know that the reputable gambling website won't cheat the users, we don't have to have a bad think about them. If they really cheat us, I am sure sooner or later, the user itself will know that thing. If we know that the casino cheats us, we can leave it and never come back to them. So far, I don't think about cheat or not because I won't let myself think about the negative.