I'm pretty sure that MS and PC manufacturers haven't implemented it, or at least it can always be turned off. Can imagine the uproar about it, if PCs were nobbled so that they could only boot Windows 8 and nothing else.
If it did happen, you can bet your bottom dollar that the FTC, the EU, etc would be onto MS like a ton of bricks.
The People's Guide
to Android in the People's Republic.
Honorary Grand Poobah Shenzhen University English Corner.
There are nine million bicycles in Beijing.
There are nine million Androids in Shenzhen.