So Vivian Meier was not a photographer? The local bands that work day jobs aren't musicians?

Nonsense, frankly. Being an artist is not dependent on monetizing your talent.

There are artists and musicians and photographers, and there are professional musicians and artists and photographers.

What is someone who writes and performs music every day their whole life but bartends to pay their rent, to you? They're not a musician but someone that makes ukulele tracks for corporate training videos is, because the latter does it professionally?