In all fairness, I kind of don't blame them. I mean grinding FATEs is mindless and boring. I grind while I watch movies, barely even looking at the screen most of the time.

The real problem here is that EXP content like FATEs are just far too faceroll / mindless that a bot can actually complete a FATE to begin with. The underlying problem here is not necessarily the fact that people use bots - but more the fact that the content is easy enough for people to use them. Attack the problem at the source and it is a much lesser issue than trying to remedy it by simply banning accounts. A bandaid fix such as a ban just doesn't work in the long term.