As i see it was the OP mistake. I don`t understand why Stake have to return his balance? The next step will "i made wrong bet, give me my money back"? There are rules, OP accepted with these rules, no problem. If Stake will say "ok, let do as he wants" - tomorrow it will be 10-20-100 OP telling the same and "you did it once, why don`t you want to do it again?"
Your example is wrong, the topic is about Self exclusion, a feature from a gambling site where you can lock your account and when it's lock you cannot access your balance, OP made a mistake by forgetting that he still has a balance, so he is now complaining that he should be allowed to withdraw even if the account is under self-exclusion.
I was watching some people talking about getting banned on Sports betting due to arbitrage related issues.
They all mentioned that at some point sports betting websites will rate limit or block/ban the user who's making a lot of profit from them.
Now another thing is Stake is using 3rd party bookie and i've noticed that when i placed a sports bet on the "not-mentioned" website then the match on which i placed the bet on "not-mentioned" makes the match disappear from stakes and i when i canceled the bet I could see that match.
This problem however doesn't occur when I access these two websites using tor.