https://sfconservancy.org/blog/2021/mar/25/install-gplv2/ https://sfconservancy.org/blog/2021/jul/23/tivoization-and-t...
Oooh. Could this be used to fight against smartphone vendors that do not allow unlocking bootloaders - or trip permanent fuses like Samsung does?
Edit: found this article:
https://www.androidpolice.com/2015/11/06/why-does-my-android...
Seems acceptable from a warranty pov. Obviously if they refuse to replace your cracked screen because you've changed the firmware then it's unacceptable.