I know Rollbit.com calls itself the most rewarding crypto casino--but is there some actual proof comparing all the different crypto casino websites together?
In the case of marketing strategy, any site are free to claim themselves as bla bla bla but players are those who decide whether the claim is true or not.
There are many casinos out there that claims themselves as "the best", "number one", etc so I can say that it is a normal practice by casinos to attract players.
What you need to do is to find it yourself which casino suits your needs/preferences.
If you are looking for rewards offered by casino, you can simply compare it yourself by visiting them one by one.
At the end of the day regardless of what you read or what you hear from other people you are the one that has to decide in which casino to play, and even if it is not the casino that offers the most bonuses in monetary terms, as long as you feel comfortable playing there because you know that the people behind the casino are to be trusted then that's fine and you should be free to gamble there for as long as you want.