As I said, the RMT would continually change up their spam to try to bypass personal filters. .com would become .(om , etc etc.
BUT I would rather have the ability to filter the spam, or at least try. We can't blacklist the RMT- just too many of them, rotating accounts. A message filter would at least give me a fighting chance.

Also, players would use their filters differently. For instance, I may block the words .com, .COM, and delivery. Joe might block .c o m, hordebank, and delivery. And so on. What Joe filters doesn't affect my chatbox personally, but overall, there will be a collective reduction in spam getting through to players. That should be enough to piss them off, and they deserve to get screwed. Yes, they will try to find other ways to spam us, and then we'll just come up with another way to block them.

So for now, we should have a chat filter that the players can use.