https://www.theverge.com/2017/8/18/16166868/google-home-support-free-spotify-accounts

Google Home can now stream music from free Spotify accounts, as spotted by Android Police. Google promised to make its Home speaker compatible with more music and video streaming services back at I/O in May, with a list included Deezer, SoundCloud, HBO Now, and Hulu; Home already supports premium Spotify accounts.

With Home, you can ask the device to play a particular song, artist, or album, and with a free-account, requesting these will start a station of songs inspired by the item you choose. If you request a playlist, the music will start playing in shuffle mode. You’re also able to ask for music to be played based on genre, mood, or activity, or for Spotify-curated playlists on a free account, Google says.