Must be Spotify deliberately wanting to disincentivize users from using Apple products at large, because of Apple's fees.So integrate it then? It’s not like there is a shortage of users requesting it.
Or Spotify not wanting to spend r&d money to optimize and integrate Spotify into HomePod (maybe because Spotify has a deals with another smart speaker makers that don't charge Spotify the same fees that Apple wants to??)
Has to be some sort of "hidden" agenda that serves to punish Apple by pushing Spotify users away from HomePod and over to competing devices.