I don't know if you've ever been to a real casino, where you are monitored 24/7 and you are not free to do anything, simply if you win too much you are out, either you cheat or not, you count cards or not, they catch you and throw you out, you can be the best card counter in the world but if you are inconvenient they cut you out
This is the reality, even with online casinos. Sometimes it's not because you violated any terms, but simply because you win too much, your account gets flagged as suspicious. It’s frustrating, but unfortunately, there’s often nothing you can do about it.
I've never been on a winning streak before to experience whether I'd be kicked out because of my good luck. I've heard about gamblers that were on winning streaks and somehow their accounts were flagged on suspicions, if it's not for violating the TOS then it's very unfair. It's ok to keep losing your money but it becomes a problem if you continue to win, it goes to show that gamblers are not meant to be profitable for long. I'm not making excuses for casinos but if most gamblers are always lucky and they keep paying out, they'll gradually go bankrupt. To keep business going fewer gamblers have to win while majority will have to lose.