The problem is not, that a false positive happens, or the user does get locked out by an algorithm, etc. - that sort of thing is impossible to avoid entirely. You have to stop bad actors, and you'll never be 100% accurate with that.
Imho the big problem is, that people who get locked out wrongly, have no recourse. There's no support, neither free nor paid, no avenue, absolutely nothing they can do, to get help. THAT's the problem.
People have to resort to trying to go viral, because only then their problem will get fixed.
As a company, that's probably not what you want. To see your false positives cause waves all over the internet... You'd probably want to see those problems be solved silently. But that would require that you offer an avenue for the user to get their problem solved quietly - doesn't it?