>If manufacturing an unlocked device becomes unprofitable and stops happening everywhere, then we can talk about what to do, but I don't think the existence of secure boot on Linux is going to make much of a difference either way.

You mean... The last decade or so? Pretty much Mobile period sans the Librem 5 and I think maybe one other? Anything with an ARM chip that'll run windows must be secure booted and signed by Microsoft.

Or how about Nvidia(mostly)/AMD(to a lesser degree) video cards, where the entertainment industry increasingly relies on cryptographic attestation to constrain what people can do with hardware they bought? There is no "fully unlocked" buying option, and trying to divest yourself of Nvidia is impossible while being able to use your card to the fullest.

Or John Deere with their crippled hardware as a service model?

I'm all with charging for convenience. That's a value add. I'm not cool with intentional crippling, and extortionate practices whereby the manufacturer maintains ultimate control after first sale either legally or practically through privileged access to signing keys.