I've been trashing Windows for ages too, but there's a big difference here: people who really want to run some particular (usually proprietary) software general

I've been trashing Windows for ages too, but there's a big difference here: people who really want to run some particular (usually proprietary) software generally have to use Windows to do that, and Windows has a lock on non-Apple computers for that and for many other reasons. Spotify doesn't have any kind of lock on music. The Apple fans are all using Apple Music, after all, and there's lot of other choices out there. Ditching Spotify isn't going to affect your life or digital device using in any significant way.