was thinking about this for a bit, would it be possible to have a auth-key based system to upload "commissioned" avatars to other's accounts for people that aren't too sure how to use Unity?
it'd require you to give the key to the person who is uploading and will only work once per key gen.
example:
[Generate Key] : {612361}
Auth-Key : {612361}
added around the build options.
(photoshopped example below)