I just checked on my Dell workstation at work and it seems they are now using this method to load the Lojack anti theft rootkit. I see the wpbbin.exe file and it's signed by Absolute Software.
I guess that is what the feature is designed for, though.
Many computer manufacturers seem to do this at least. There might be a way to trick the UEFI into thinking that you’re installing a non-Windows OS but I’m not sure.
