Can you point us to the source code for verified boot? How about auto-update?
Here is a talk on verified boot - https://www.youtube.com/watch?v=kdpZC9jFzZA&feature=emb_logo
https://chromium.googlesource.com/chromiumos/platform/ All associated projects - "uboot", "update_engine" are there. Some are also in platform2/.
Let me guess ? You"ll come up with some other snark to put down how this OS is open source.