Another bigger question to the ops is, why didn't he contact the casino when he received such unusual bonus from them, and from his explanation he receive such bonus twice and have managed to withdraw 50k-80k that is huge profits enough for the ops, and if he wanted to get any clear understanding on the terms and conditions on the bonuses if there be any then he should have first of all reached out to the support team of the casino to get the template for the terms and conditions of the bonuse before he started gambling with it.
So its still a win-win for the ops and I suggest he move on, but anyway, he already stated that the thread was meant to just warn others, who may receive such an offer from the casino.
He already provide some speculation on he get that promotion offer on the introduction of his post. He assumed that Rollbit might have access to his Stake information for being high roller in there which is really possible since some casino has some connected networks for players casino information that's why they can detect fraud activities even it happened from different casino.
Casino doesn't violate any ToS to claim the bonus. I believe the reason for the ban is due to his successful completing the bonus due to his strategy.