Tim Hardwick, MacRumors:

According to Spotify’s release notes, Siri support is compatible over connected AirPods and also extends to CarPlay and HomePod via AirPlay. On iPhones and iPads running iOS 13, Spotify will also now turn on its Data Saver feature when a device has Low Data Mode enabled.

In addition, the streaming service says Spotify is “now available on Apple TV,” although it isn’t showing up in the tvOS App Store as of writing, so rollout is likely scheduled for later in the day.

“extends to CarPlay and HomePod via AirPlay” – Played with this a bit. If I ask HomePod Siri to play music via Spotify, Siri responds:

I wish I could, but I can’t open apps here.

Requiring AirPlay is still a significant bit of friction.