Or one of the other small independents that won't work with sites that have drunk the Goog-Aid, but will be perfectly fine and even preferable on the rest of the document web, and even some of the interactive ones (old-school forums and the like.)

I don’t wish to use Windows or Linux or Android, so it looks like I’m set.

iOS/Mac? Apple sells advertising too. They're just as evil if not more than any other megacorp.

Do they track me across websites? I think the AppStore is a shit show too with or without Apple ads.

Yes. They absolutely track you across websites.

And I’m sure you have evidence of that?

And if I wouldn’t use a browser by an adTech company, why would I use a phone with an operating system built by the same adTech company?

Perhaps because you forgot both are Open Source with privacy-respecting forks?

And then you give up every app that uses Google Play Services.

If you’re using Google Play Services you’re still being tracked and have closed source Google on your phone

If you're on macOS, the Kagi people have their own "Orion" browser now too:

https://browser.kagi.com