I can remember how Blizzard agents would respond in their forums on the subject. They would say that profanity is against the Terms of Service. The profanity filter does not exist to allow players to use profanity. It exists so those who don't want to be exposed (or parents who don't want their children exposed) aren't affected by a player's loss of self-control.

I would guess that SE's stance is more or less the same.

As I said earlier, it really shouldn't be that much of a concern to anyone as long as they aren't excessive in using it. It would take someone opening a ticket with the GMs, which isn't likely considering how annoying the ticket system is to use (unless more than the profanity is being reported). The GM would then have to decide that the use was was worth taking action against the player's account.