And if you are able to make winnings on large amount of bets, you are very likely to be banned by Stake.
I'm wondering why you are thinking it in this way! No reputable casino will ban your account if you win on your large bets. They will only ban you if you do it by cheating. Stake or any other casino will lock your account if you continuously win on big bets with suspicious activity. They will unlock your account if your winnings are legit.
I agree with you, it is unethical when we get big bets, and then without any reason our account will be blocked. Any casino will be questioned a lot in this regard. In addition, Stake.com is the largest casino and many gamblers have made big bets. That's not a problem because Stake can pay any amount when an authorized user gets Stake.com. Unless there is suspicious activity and proven in the investigation. Because otherwise, all is well as a gambler's luck.