>>366376751
There's a lot of different reasons, usually varieties of autism. It would make more sense if all avatars had voice changing profiles to match the avatar, but voice changer quality isn't good enough so it doesn't happen. Using one with an actual robot avatar can work well.

There was one guy in an MMO raid I did once who sounded like a helium balloon and everyone spent the whole raid making fun of him. TTS can also be very useful if they can't make noise at night since it would wake up their moms. There's retards who will assume anything not proven male must have ovaries, and it can be profitable to manipulate them. Some are on alts and don't want to be recognized. There's also ERPers who don't want to hear dude voices but want to communicate somehow, so you'll see their partners using it. And yeah, there's plenty of extreme social anxiety cases.