Looks like VRChat is using persona as well - multiple mentions here:

https://wiki.vrchat.com/wiki/Age_Verification

https://hello.vrchat.com/blog/age-verification

And quite a few discussions about the controversy on Reddit, including comparisons with the Discord Persona debacle:

https://www.reddit.com/r/VRchat/comments/1r0jj7g/with_todays...

https://www.reddit.com/r/VRchat/comments/1r511h4/id_verifica...

This can be seen possibly as even more invasive in this case, given the larger social aspects of VRChat as well as apparently this being done for more than a year by this point.