I believe you should also try to look at the situation from the casino's point of view too. Because from their viewpoint, you're merely farming for the cashback/rakeback rewards and not actually using the site for real gambling. From the point of view of the business owner, you're a leech that's taking revenue out of the business, not someone who brings something into the business. What would you do if you had such a "customer"?
Makes sense.
No casino/sportsbook likes long-term winners which is why they usually resort to this stuff to try and keep their business alive. Rollbit actually released all of his funds successfully before banning him which is the most important part.
Sites which confiscate funds and ban winners are basically scams and Rollbit is clearly not one of them.
I believe not. As a business, I think casinos accept that there will always be a very small percentage of users who will be long-term winners. BUT as long as they don't "abuse" the service by taking advantage of the rakeback/cashback rewards program by betting exclusively on 99% implied winners, then they won't be banned from the service. All users are expected to play in the casino under the the casino's terms. You either actually play/gamble, or leave. You could also play a game where you could find your own edge, like BlackJack.