OP: "It has an autobot harvest feature..with separate song composition data automatically created by Discogs It is spouting out garbage..."

Your 'autobot' is a standard relational graphic arts database misapplied by you as real world discography. They never claimed to be what you say they are not.

On discogs "Written by" is not Oxford English. Don't try to speak Discogs in the real world. Just on Discogs where "written by" is the mechanical rights assign just below or after the track title on the product dress. It's entered, or not, by the users, not 'autobots.' It's entirely and completely optional by the rules of Discogs.

Garbage in - garbage out. Social media does not produce high quality data. The user qualifications are "has internet access." The forum based rules & guidelines are social media in and of themselves.