Very very few existing phones allow bootloader unlocking and using your own keys, its why GrapheneOS only works on Google Pixel devices.

I imagine at some point even Pixels will stop allowing that.

Al the time. Offputting names and branding, AI logos or images, lack of basic feature explanations, lack of any screenshots, and so on.

After all that I’m only interested in using a small fraction of the various projects I come across that would be useful to me.