ID is a special profile for holding songs that aren’t released and the artist is unknown, primarily used in DJ sets. As best stated by Apple Music:

Where there’s an ID, there’s a mystery: Shorted from a common forum request (“Track ID please?”), the tag indicates an unidentified track in a DJ set. Dance artists may tease an ID for months before revealing it to the world.

Any artists with the name “ID” (but are not unknown) should be disambiguated, as this profile is purely used for holding tracks which don’t have a known artist.