As far as I have noticed you don't get a ban if you swear while speaking generally. I did that a lot and never got even a warn.
However, if you turn your profanities towards another member of the forum, things can get nasty for you.
This was all common topic derailment, every forum has that
You made your point with this thread already, don't try to forum police it now - there are people doing that already, and osranakurwa's ban is the proof of that. If they felt there was need for more intervention, they would've done it already.