You can read reviews, accusation list and make your judgement about Rollbit, which in my opinion, is trusted enough.
[Overview] Comprehensive list of Crypto Sportsbooks
[LIST] Scam Accusation Cases Against Betting Platform on The Forum
Although there are several accusation posted against them but still razer is there to help those legitimate people who encounter a problem and solve their issue. We see those feedbacks posted regarding that there cases has been solve also those found cheaters is totally got punish for the actions they have done so before they gamble here or even anywhere they should know the rules set so that they can avoid any problem especially for new people want to try this casino. But for other who already know but still try to make their shady actions this indicate that they can't do illegal things which they usually do on other casino since they can easily busted by their representatives or people working on their Rollbit.