I don't know but for me it sounds ridiculous. This is a person's mistake to play when they know they are game addicted. I think it is simple as ABC. Even if one online casino bans you, you will find dozens of others where you will play:) with brick-and-mortar casinos everything looks easier as you will have to make a long trip to another location when you have banned yourself from all the closest gambling houses. With online casinos, you always have a choice:) if we are taling about addiction, you will never stope until you get the shot. Otherwise, you will not be able to think about anything else except gambling. It works the same for drug or alcohol addiction. If you ban yourself in one casino, it is never enough. A friend of mine did that in one online casino, but the next day he was playing in a brick-and-mortar one. If you think it is enough, you should do it on your own. Hidding a shot is not the way...
Also I think that people are too harsh to casinos, I mean they give the addicted person all kind of free passes while a casino cannot make a single mistake, and if they do then they are not to be trusted, casinos are made of people too and as such they make mistakes, forget things or simply do not know how to do their job properly yet and something like this happens.
However if a person cannot resit the temptation to gamble over such a small mistake then they are nowhere near recovering, because as you said even if stake had banned him there are hundreds of casinos online where the one that started this tread could have gambled his money away.
And if happens that he had spent out his money on other gambling sites then pretty much sure that he would made out some complaints too that he had lost money and made out some issues.
It is really just on this point that Stake did really have some small mistakes on here but as a user then you should really obliged yourself on having that kind of control.
If your gambling addiction is severe then expect you would continue to commit out such mistakes all over again.