We’ve added a new feature to the old chat filter, now renamed as the profanity filter. Its default function is still to be turned on to filter out all the words (and URLs) on our blacklist, but we’ve added the option for you to turn the filter off. We recognise that RuneScape has a maturing player base and, as such, wish to give you the freedom to choose for yourselves, while also still keeping the filter for those players who do not wish to see swear words and the like.
In the end, this probably isn't a big deal. However, I have seen countless threads lately on the RS forums asking why they were muted for no reason with no evidence and no message. These people have no idea why they've been muted, and that's a problem on Jagex's side a good portion of the time. Once again Jagex suffering in the realm of communicating what they're thinking to players.
I don't like potty mouths as much as the next person, but I'm a grown person and can deal with it. I have an ignore list and a profanity filter if I want to use it. That should be plenty, bar only the MOST offensive of language. And even then, I can't see a time when private chat between longstanding friends should be moderated. If someone PMs me something I don't like, I add them to ignore. Their messages disappear. End of story.