> It surprises me how much of my Spotify library is no longer available. There’s at least a few dozen songs in my Spotify library that have been taken off the platform. It shows up in the list greyed out. A lot of good songs too.

This probably has more to do with publishers and licensing contracts than artists pulling their music off from platforms. Sometimes even bigger artists' albums disappear when publisher is sold or goes out from the business. Or the licensing contract's period runs out. As sad it is, many artists don't own the rights to their music, and if the rights owner is defunct, then there are missing albums or even discographies.