Other games have done that type of thing, where certain words become auto-blocked by chat filters server side. RMT bots always, and I mean always, end up getting updated so that those words are spelt using variations. For instance:

.com becomes .(om or . C O M or anything that makes it so that you still understand what they are saying.

It goes for basically any word that would be used. They ALWAYS find a way around it.