Chip manufacturers could even decide that nothing good happens on open source operating systems, so you're now only allowed to run Mac or Windows operating systems.
The point is really that they're taking full ownership of the chips from you.
They could, but not with the new Pluton stuff. That would be enforced with secure boot, which has been around for a while already. Again, the capabilities already exist. The barrier for a would-be censor is political not technological.
Chip manufacturers could even decide that nothing good happens on open source operating systems, so you're now only allowed to run Mac or Windows operating systems.
The point is really that they're taking full ownership of the chips from you.