Rollbit had been in the gambling industry for some time now and their reputation are growing each day. Although there had been some hiccups, but the casino is taking care of them and continuously doing their best to solve the cases justly.
I don't see hiccups. Accusations can come but if they are invalid accusations, no hiccups. Hiccups are for your mistaken customer support cases which must be rang the bell by users before the team resolving it for customers. I didn't see it from Rollbit and what I knew is those accusations were invalid.
They have managed to gain this reputation with not only marketing but with their legit business dealings and lot of gambling exposure with unique options to players keeping up with the trends like they were first to introduce NFT with gambling or trading options and lot more which has helped them to reach this mark.
Some gambling business companies run marketing campaigns which are good but at the end they shown their faces as a scam casinos. Rollbit after a few years in bitcointalk has gained very good reputation and if we counted total money they spent for marketing just aimed at bitcointalk community, it is massive already.