I've actually seen a spam bot use a hyperlink to bypass thatwe put this in cause of the bots and spammers that came here to spam advertisements.
The other way around would be more effective, but I don't think the addon works like that.+1.
Maybe we can offer a compromise like say if you're signed in on the forums using your Steam account, you can't post links at all, but if you create a forum account, there is no link restriction?