Deezer should support the Android Automotive OS as it has received a lot of good reviews by those having tried it out - so it is clearly the way to go for car manufacturers.
Spotify is supporting the Android Automotive OS (and has been receiving lots of free advertisement by doing so).
Polestar 2 will be the first car featuring Android Automotive OS, ref.
https://www.polestar.com/uk/polestar-2/google-polestar/