There are a number of contributors to this thread who have said, in effect, "so what, someone will jail break the device and unlock UEFI on those ARM devices, chill out!"

The DMCA makes this kind of jail breaking illegal in the United States. The EFF has managed to establish an exemption for unlocking of smart phones, but that exemption does not extend (at least yet) to other computing devices.

If MS is successful in forcing this, I would not put it past them to use their legal muscle to intimidate, harass, and otherwise supress anyone trying to undo it. If key provisions of the PIPA or SOPA legislation find their way into law, this gets even worse, as they will have an easy way to block access to this information, no matter where it comes from. These proposed laws criminalize even providing links to such information (that is, instructions or tools to circumvent DRM (Digital Rights Management) systems, proprietary encryption schemes, etc.)