The manufacturers should respond with capitalism:

- offer a locked and unlocked version and let the free market decide which is preferred. Provide an unlock option that divorces the device from corporate control and release the hardware to the customer (i.e. a MacBook that can be unlocked and put Linux on, but can never be used for macos again)

- subject to FTC anti-monopolistic regulations just like other industries. In some alternate universe, the FTC decided that sony should not have a monopoly on PS5 games, and competitors should have the ability to enter the market. This is the converse to unlocking, although competitors would still be bound to preventing copyright infringement.