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HybridPetya: More proof that Secure Boot bypasses are not just an urban legend
(www.theregister.com)
Icon base by Lorc under CC BY 3.0 with modifications to add a gradient
I think it's important to add some nuance to what you said. While it's true that computers ship with Microsoft keys. One can remove them and install their own. I run all my machines with self signed bootloaders/kernels and it works great!