This is to reduce spammer's ability to pollute our database with their crap. For discussion, see:

  https://chatlogs.metabrainz.org/brainzbot/metabrainz/2017-05-23/?msg=3916074&page=5

Hiding the bio/link fields for limited users might be an easy way to go. Possibly add a note about that that becomes possible when the user is no longer limited.