To many case like this so its good to ignore those troll so that we will not feed up their ego to do the same on other platform. We only entertain those legit accusation with valid proof since this is more worth it to lend some attention.
Don't feed the troll.
I also doubt Rollbit or any successful casino will ruin their reputation for just like that since they could earn more revenue for providing good service rather than doing some shitty things out here. Many people still believe that this casino is still a one of the best casino exist so unless people think this way then they are still fine.
They will not ruin their reputation, their business after spending years to build it successfully. Pay the users and attract more new users in future is better. It is a strategy of a trusted and successful casino but they will only pay for valid users and valid bets.
If a users is an abusers and bets are cheating their systems, they will not make payments for abusive cases. A big casino is able to pay big amount for big valid win so it's not logic to say they scam some small gamblers with small wins. And if proofs from gamblers are not enough, I have less reasons to think their accusations are actually valid.