What is the source(s) of artist genres?

[friendstotheend]

Plan   Premium

Country  USA

Device  DAW Workstation

Operating System Windows 10

My Question or Issue

 Where do the artist genre tags come from ?  Are they aggregated from multiple track submissions or does Spotify AI assign genres?

Your answer will help me with plans for developing artists.

Thanks, and sorry I could not seem to find answers on the community or by Google searches.

Yours truly,

Thom Kurtz

Friends to the End Music