I agree with you except streamers gambling fun money, I don't know who can bet that amount on a crypto offshore casino without a solid reputation. In addition the amount we can get is meaningless $1000 represents only a 0.1% cashback of $1 000 000. So I wonder if it's not just a promition to make people think there are many real high rollers gambling there.
This could also be another way of thinking of it, as the more they can convince people that a huge amount is being rolled out, the better it is for their business, as more people will want to come and try out what those people saw at that casino that makes them spend such an amount in betting. why they want to try it, and how they are using the casino; they are also wagering, which in turn will make the casino richer.
No doubt there might be people wagering that amount there, but the number won't be too many unless there is something going on underground in that casino that is just between the Casino management and the gambler.