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.
Yes it is pretty much the same, Android you just type the IP address, Apple you download a config. For anyone not knowing about it ( which sounds like you do) It is system wide, and not just for webpages, lookup goes through the private DNS. It is how the app version does it also, you just get a button to turn off the private DNS and use the general 8.8.8.8 or 1.1.1.1 for when you need to resolve a site, and maybe a few other functions. I forget which adblocker it was, but one was selling user data, so setting up your own DNS or pihole seems the best way.