Im pretty aware that most of the problem that people had with Rollbit right now are related to their sportsbook. Probably some people find some loophole on it then most decided to abuse it whatsoever so its fine as long as you dont really abuse anything
To some cases they have responded in this thread as well on scam accusations board also specifying the problems but if gamblers keep abusing the rules team won't help them in that cases and have right to block accounts or if sportsbook provider limits up your account.So playing legitimately on your end would definitely help you to avoid lot of problems.
One of the recents incident involved people betting at low odds thus making them easier to level up their account then claim bonuses. This is pretty much gray area imo because there isnt any specific rules regarding this but if Rollbit is going to count this as an abuse then I guess they should start rejecting all those low odds betting before it become an issue for them