God no. What a terrible idea. This game is toxic enough at the best of times. Seriously I would never want to hear anyone in-game over voice. Imagine AFKing in Edge and having your ears blasted out.
This isn't as easy as it sounds. It would require significant technical infrastructure and resources. Still, I'm not on board with this because I think it would do more harm than good, and Discord is a solid alternative.
No support for many reasons, mostly the ones given above. It also seems like it could be a pain on the moderation side of things, and certainly isn't an osrs feel.