>>327487141
I think it's usually just insecurities with their own voice, thinking they'll embarrass themselves or maybe just have crippling social anxiety when it comes to talking. Still cringe though. 
And then of course there's the mutes who do it strictly to better sell the appearance of being a female/their female avatar. And don't get me fucking started on selective mutes
>dude with massive titty avatar occasionally joins my group
>at first thought they were full mute because they didn't talk much
>one night they're talking just fine
>try to strike a conversation with them another day and they go back to just hand gestures
It's honestly just annoying. Especially when you have to read out their fucking scribbly handwriting to have a conversation