Kids don't care about corporate ethics or artist respect, they care about where their friends are and where their playlists and memories live. Spotify is the soundtrack of their lives and my own kids love their sort of curated history of music. Moving their playlists isn't going to happen, asking them to switch to my Apple One subscription would be like asking them to rewrite their social identity. My own household would be in open revolt if I asked them to switch to anything else.