My bank tried to add typing heuristics on the password box years ago. It wouldn’t lock you out, but you had to go through extra verification steps if you failed. I failed the test pretty much every time I logged in, and I’m sure it happened a lot because 6 months later it was gone. In that use case it was an extra attempt at locking down bank access, which I can appreciate, but I hated that it was wrong most of the time.