Mailing the story:

Why is this a problem? Because there's no central certification authority for UEFI signing keys. Microsoft can require that hardware vendors include their keys. Their competition can't. A system that ships with Microsoft's signing keys and no others will be unable to perform secure boot of any operating system other than Microsoft's. No other vendor has the same position of power over the hardware vendors. Red Hat is unable to ensure that every OEM carries their signing key. Nor is Canonical. Nor is Nvidia, or AMD or any other PC component manufacturer. Microsoft's influence here is greater than even Intel's.