Thank you.
You brought up Apple. This is probably one of the biggest targets with things like this. You can't replace even a screen on something like this. Even if the part is available and the person has the know-how, you don't have the ability to do that.
They're very pernicious in how they've set up some of these systems, not just the TPMs but the requirements for things like passwords and tools that will unlock a device in order for the repair to even be done.
I'll give you an example. PlayStation has two major components to it. It has the disk drive and it has the motherboard. If the disk drive were to fail for some reason and you were able to take a disk drive from another PlayStation that maybe has another problem with it, or you're able to find the part online somewhere and you have the know-how to replace that part in the PlayStation, the motherboard will not recognize the perfectly fine disk drive because the serial numbers will not match up.
That has nothing to do with copyright. These are the types of things that manufacturers have done using copyright legislation as a shield. Even if you have the know-how and the parts, you still cannot get that device to function because of the way they have set up that device to not allow it to work.