This is bonkers paranoid. Don’t ask me, reference the article linked above by one of the most prominent Linux distros on aarch64 Macs. The author is clearly qualified when clearly stating that the stance is not this nefarious.

Not only a PR hit. We now have legislation that will force Apple to open up their iPhone. Your cynical take that Apple is waiting to do it is a mistake; they’re losing control of the iPhone as we speak because they locked it down too much.

Were that their attitude they’d be doing less to make it possible today.

You can't have a good development machine that is locked down. As long as Apple wants people to write software they will have to have at least one open platform.

That’s just not true. Tons of people use a Mac as a software development machine and virtually zero of them install a non-macOS operating system.

All it has to do is run Docker and people will continue developing Linux software on it.

That said I don’t think Apple is planning on locking down macs, simply because they have never done so (at least not in the modern era), whereas they have always done so with i-devices. Sure there’s always a chance they could change one practice or the other but there’s no good reason to believe they will.