if I understand you correctly. I've found no restrictions on what I can steam through my car radio via bluetooth.
I joined Apple Music a few months back... mostly for my grandsons so I haven't experimented much with it myself... I'm not sure how it works. While driving, however, I have discovered I can play nearly any song ever recorded AS LONG AS I know the artist and song title, which I rarely know. I think the cost is about the same as Sirius Radio? I dropped Sirius a couple of years ago because I only had a sirius radio in my pickup, which I rarely drive these days. Can you download music now with sirius? - JamesJM