Case a) The artist died less than 70 years ago (say, John Lennon): so I asume that the righholders claimed their profile: family (or a person delegated by the family), or the label (in case there is only one).
Case b) The artist is in Public Domain (typically year of death +70, say Beethoven, Chopin, Bach or Scott Joplin). Nobody has the exclusive, natural right to administrate the profile. However see the case of Johann Sebastian Bach: the profiole is verified and has a blue tick (is the only case I found after a quick research of "old" artists). My guess is that a Bach Society claimed the profile.
Some first hand information?