It's a new thing it's just in the beta but it seems to be across everything including private chat. Anyway not sure why they're doing it but hopefully it won't make it to release.
Yeah with your clarification I realised I'd seen a thread on it somewhere, although as mentioned it's not a topic I feel strongly about in ED. I swear like a trooper where the situation allows or warrants it but I am also capable of conversing with a more varied vocabulary when required.
As far as potential justification for introduction is concerned while it
could be connected to some sway tencent has it could also be down to simple quantity of complaints, and people taking things too far (both doing and complaining).
Regardless of how any individual may feel about their right to express themselves in as obnoxious a way as possible, it has to be weighed against how others feel about their right not to have to see that sort of thing at any given random moment, particularly if they are already being fired upon in a particular way they feel infringes their implied right to go anywhere they want in any mode they want unchallenged.
Or in other words, in those occasions where polar opposite personality types clash, it's just easier to filter the chat than it is to persuade the meek to stay in the shallow end of the pool.
tbh I always assumed there was a swear filter anyway and had just never bumped up against it.