Not because the users want an adults-only platform specifically. But because normal adults don't want to keep running into barriers in communicating with other normal adults about whatever they want without risk of being unnecessarily censored by the platform. Which includes fetish material.
The problem is, if VRChat DID fully endorse it, and banned everyone under 18 from being on the platform altogether, that's a tacit admission that it deserves an AO rating, limiting them from the other end by being specifically for adult content and being banned from multiple platforms as a result.
From the Patreon! Fox and Falco, if I was allowed to be the costume designer
Patrons get these early birdy~ hint hint nudge nudge
twitch.tv/rickpgriffin
HollllOOOOOOOOw Mina!
twitch.tv/rickpgriffin
The Mina and the Motorcycle