This is no different than what's done in ANY entertainment media contract negotiation that takes place with "on-air talent".
It alleges that many of the “contests” are staged and artificially manipulated and potentially violate laws around such games. I think to many that might feel like fraud.
I'm sure there's some disgruntled employee complaining somewhere, but I have not seen any legitimate complaints about him. All those "Mr Beast is a fraud!?!" videos have no substance, and are just people using his name for views.