Haha. I’m also wondering the same thing. It’s either U2 or David Guetta playing on startup For me. We must have gotten that music for free a few phones back. The native Spotify app on the car doesn’t always load so I’ve lost faith. Plus, i like the gapless playback when using the phone and using Alexa auto.
Have you tried disabling Apple Music on your phone? Wondering if that will do it.