VRChat's internal quality settings were recently adjusted for Android, most notably by changing Anisotropic Textures from Forced On to Per Texture. This setting is still set to Forced On in the editor's Mobile quality level which can make it difficult to understand why the same textures have an observable loss of quality when viewed from in-game on mobile devices.
The SDK needs to be updated to apply these new anisotropic quality settings to the mobile quality level