Could have fooled me, because I have maybe half a dozen Android installs on devices that run all the same applications and are functionally identical to any manufacturer version out there without being related to them at all.
That's my entire point, there is no major concern for most people about where their Android build is sourced as long as it runs Android apps. If the open source "world" is not dictated by being built on open source code and instead dictated by a label of purity based on the lack of proprietary, monetized or closed source portions then... yeah, that's annoying. It's computer veganism. I don't begrudge your choice to engage in it, but I do demand my own freedom to eat a salad any way I want it without arguing the merits of the lard that went into fying my croutons.
If nothing else, I'd urge for caution thinking that this slice of open source fundamentalism is who open source software is primarily serving (it's not, that'd be the users that use the software for software things) and some self-awareness about that group of users being out there.