I don't care if anyone has a Xiaomi, Oneplus, Samsung, etc. Each brand is using a modified version of Android, and they chose to be compatible with each other. But for example the "blue vs green bubble" drama is a thing specifically because of Apple locking their unsuspecting users into a closed ecosystem. And it sure isn't Android's fault for not being compatible with it.
The more power a company like this gains, the worse will it be for the whole industry.
I will admit the openness is why I chose one disgustingly evil company over the other. You do have a point there. But there is no getting over the fact that Google is doing serious damage in many ways and just because you managed to uninstall all their spyware when you bought a pixel or any android device you are still funding that. You personally help them grow and become more of a problem for the Internet at large.
And I like that you completely glossed over the biggest point... That they both profit off of slave labor. And of course child labor.
But hey open software means slaves are not as bad right?
Like I said, an Android phone does not equal a Pixel made by Google. If you are concerned about where the resources used to manufacture your device are from, get a Fairphone and flash Lineage/CalixOS on it. That way you are "supporting" Google in the smallest possible way and you can still use a smartphone.