I paid for my Android phone. Google is still collecting every piece of my life and my family's.

Even those who purchase hardware where the bootloader can be unlocked, it takes much deeper technical knowledge to install a third party OS than, say, a third party OS on a PC. And that is assuming someone else built the OS for you.

A bit more seriously: there are shades of grey. Just because they gave you something for what you paid doesn't mean it was a) fair, nor b) what was (effectively) advertised. Legalese around "you really just bought X" doesn't necessarily put everything in the clear.

i.e. when you buy an Android phone, it seems reasonable for people to expect that to come with a functioning Android-based OS. Just because you can install a different OS on it doesn't mean the default one isn't subject to criticism.