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It’s less obvious than with Netflix because the songs don’t completely disappear. Spotify pays different rates for different songs depending on the label so there are certain songs they’d rather you not listen to and other content it’s much cheaper for them if you listen to so they push you to that content.

Lots of songs do completely disappear.

Just today two of the albums Spotify recommend to me as "Discover this" were unavailable, so they seem to be having some sort of issue with that.

If they do then it's not noticeable by the average user.

didnt neil young pull his stuff from spotify in protest?

Yes but only for a couple of months.