Spotify's ARM menu entry installs the web player in quattro
Pull request 15768, merged into quattro, installs Spotify's web player on ARM, where the Linux client is built for x86_64 only. Super + Shift + M opens that player. Nothing changes on x86_64.
The pull request says the menu was hiding Spotify on ARM, and that Super + Shift + M opened an installer that failed there. It says that on ARM, Install > Service > Spotify installs the web player as a web app, and that omarchy-launch-spotify opens it.
The web player needs Widevine. The pull request says Chromium already fetches Google's linux_arm64 Widevine module through its component updater, the same way it does on x86_64.
birkskyum wrote that he installed the web app on a Yoga Slim 7x and an M1 Max MacBook Pro, logged in, and played songs on both.