Boards needs an auto-ban system to prevent scams from being posted in the first place
(Not to be confused with the Autobahn) If you paste certain links, prevent the thread/comment from even being placed, and put a 1 hour forum ban on the person and a red flag for the mods. The mods can check what they were posting within that time and send you a notification for why they are extending the ban (or worse) or they remove the remainder of the ban and warn them not to post that type of content and why.
This would instantly prevent the "rewards" website scams from being posted and spread around so much. This system could also be used in the client so anyone spreading links through there would be stopped as well.
Keywords not contained in a link could also be added as new scam trends popped up, so changing the name (from like scamsite.com to scamsite dot com) wouldn't consistently work. Automatic censoring might not be a popular idea for general use, but against spreading scams there should be no issue.