No it's not. They have a known-good path you can deviate off of that allows you to run whatever you want with no restrictions. Everything still works, but the o

No it's not. They have a known-good path you can deviate off of that allows you to run whatever you want with no restrictions. Everything still works, but the only thing is that since you can now do things that they might not have thought of, they are not going to be responsible for the side-effects that might have. Essentially, it's an irreversible switch which allows you to run firmware that is not signed by their private key, which makes it a end-user choice: you can be in a safe and protected world, or you can be in a free do-what-you-want world; all you have to do is choose.