Worth pointing out that when this complaint was filed Spotify was publicly complaining about the lack of equal access to the HomePod and Apple Watch.[0]
Apple addressed this with API’s at WWDC the following year.[1] Yet here we are, almost 4 years later and Spotify have yet to implement support whereas competing services have.[2]
[0] https://newsroom.spotify.com/2019-03-13/consumers-and-innova...
[1] https://developer.apple.com/videos/play/wwdc2020/10061/
[2] https://www.macrumors.com/2021/05/06/deezer-announces-voice-...