It is fucked up that the fans who are transcribing do not get a cut, but it’s not like they were misled to believe they would make a cut before they started doing it. The people doing that are doing it out of a passion for the music.
I’m not saying they shouldn’t be paid of course they should, if it was up to me I’d say make them all rich. I just think it’s a stretch to imply that Spotify is stealing anything here