The reason GM is dropping HD Radio is to gatekeep their in-dash entertainment systems and eliminate as many free options as possible in order to push people into paid subscriptions.
HD Radio (free) = gone.
Android Auto (free) = gone.
Apple Carplay (free) = gone.
GM vehicle purchase = pay monthly, forever, to get your favorite content.
This is why no country should *ever* have an absolutely hands-off approach when it comes to business behaviors. What you (and @Bongwater elsewhere) are describing is essentially what happened in the U.S. back in the 1870s and 1880s before the development of radios and automobiles. It was why the public demanded, and Congress ultimately pushed through, laws regulating the growth of business trusts; and it was why, back in the 1940s (I'm going by memory here) the U.S. Supreme Court told the Hollywood movie studios that they couldn't own the means of distribution of their products. Sadly, most children, even teenagers, sleep through their history lessons, never thinking it has anything to do with them or that it could happen to them. As we are now learning, that is wrong on all counts!