Does anyone actually love Apple TV+?
It's better than at launch, by far, but it's the lightest platform of all. The content is stagnant.
I think most people who have TV+ also have another service, let it be cable or Netflix or Disney or HBO. And I think most people try to limit themselves to 1 subscription at a time.
So all in all, Apple TV+ is not a desirable service.
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As for Apple Music, there's no free tier. I didn't have any money when I was a teenager and it was impossible to get a credit card before 18. I suspect this is why they go with Spotify by default. Spotify then becomes a trend amongst teenagers and then the trend is almost irreversible.