I mean, I used to play at Rollbit pretty often and this is the first time hearing something like this. There were definitely some players on lucky streaks who were generous sharing part of their winnings with folks in chat, but never saw anyone randomly tipping strangers 500 bucks and you gotta have some screenshots or something to prove it, no?
Tipping $500 is too much and that user must be millionaire to distribute big value tip like this. $500 is a big money for tipping and except I am a millionaire or billionaire, I won't tip anyone with that big money.
Casinos don't play around when money's involved.
They don't play around to destroy their reputation and business because it takes them many time and efforts to build up a good business with good reputation.
Destroying it is very easy and can be done very quickly but a good casino never intends to self-destruct its reputation that is helpful and necessary for their business operation and income.