Isn't this Palladium?
At least Palladium didn't interfere with the OS of your choice. No one ever signed up to MS's TPM scheme, so it became just a useless chunk on the motherboard instead of the Windows anchor they had hoped it to become.
UEFI fixes that problem by prevent you from even booting to that undesired OS thereby signing everyone up to the MS scheme by simple opt-in. The spec provides for installing your own keys but leaves the implementation optional. The bean counters will make sure the option does not get implemented.
