Adding additional fallbacks for the fonts used in VRChat, would allow users to still see all names and menus properly, even without having the current restrictive fonts installed.
In practice, this would allow Linux users to see non english characters (e.g. Japanese).
Fallback fonts that I would suggest, would be:
Bank Gothic -> "Ume P Gothic"(for Ubuntu), "UmePlus P Gothic"(for Mandriva), "Takao P Gothic"
Dosis (is available for Linux) -> "UnDotum"(for Ubuntu), "DroidSansFallbackFull"
Of course fonts could also just be shipped with VRChat.
Documentation on fallback fonts is available here: https://docs.unity3d.com/Manual/class-Font.html