FF14 is not made for hardcore players.

[Vahlnir]

this is the only game where I've heard of people getting banned with the sole reason being swear words aimed at nobody or at most, themselves
that's pretty bad in my eyes, because it makes you wonder why the swear filter even exists when a singular use can get you banned if you're unlucky

It happens in WoW too, at least in extreme cases. It's just more tolerated there I guess. I don't really understand what the big deal is though. Just...don't curse? Seriously, that's all people need to do. lol I curse outside of the game more than I probably should, but putting my filter on while playing an MMO (or going out in public) isn't difficult by any means.