Until that day comes there is nothing anybody can do except agree to ToS and let the casinos become judge. jury and executioner while they freeze accounts of those breaching their ToS.
Seems that if you win too much you can also break their ToS:
17. Cancellations, Suspensions and Closure
17.1. Without restricting our ability to rely on other remedies that may be available to us, we may suspend and/or terminate your account, cancel any outstanding bets and/or confiscate any or all funds in your account at our absolute discretion if:
[...]
(vii) we determine that you are acting in a manner that is detrimental to the conduct of our business.
at the end of the day there is a difference between those casinos that are seizing all funds and freezing accounts and those casinos that return deposits but do not allow for funds won by breaching the ToS to be paid. In that scenario it does not sound like a scam to be honest.
If we take arbitrage betting for example, it is almost impossible to prove it but if casino takes your winning under suspicion that you are arbitraging, you will get your deposit back but you will lose that other bet on the other site and lose money. And, if you are not arbitraging, just damn lucky and casino seize your winning and refund you your deposit just because they suspect something, you can't say that you didn't lose your money, your winning belongs to you. It is something to discuss in some other topic I guess.
I am out of this topic.