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.
Your phone privacy is owned by your isp and the OS maker. You arent doing the world any better being on android. Google is fucking awful too. Both are awful and should be broken up. They are way too large and powerful and only having 2 phone OSes in the world everyone runs made by 2 greeeeedy ass corporations is the problem neither of you can solve gloating about which evil corp you give money to to interact with modern society.
So i support Google by using an open source OS? Just because your phone uses Android dosent mean it has any Google services included. Since Android itself is open source, there are many Android OSs that dont include any Google Software.
Network effect. Same reason why you should use firefox (or alts) as much as possible over chromium (or alts).