It's not an app store. It's not like throwing stones from a glass house, because it's not an app store.
Most of the integrations do not have anything to do with using the copyrighted music, e.g. a playlist export app
Most Spotify integrations literally involve playing music through Spotify, so it's curious that you pick one of the very rare integrations that do not.
The main point is, Spotify has a platform, like Apple, but is throwing stones from a glass house when it comes to trying to build on the platform.
Most of the integrations do not have anything to do with using the copyrighted music, e.g. a playlist export app.