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App Store to Be 'Split in Two' Ahead of EU iPhone Sideloading Deadline
(www.macrumors.com)
This is a most excellent place for technology news and articles.
Not really, you can just remove your Google Account after setting it up and things will stay working without issue.
You only really need a Google account to download apps from the Play store. But you can use sideloading and different stores for that.
That's (part of) what I said. You can also remove your Apple ID after you downloaded some apps, but that doesn't change the fact that you need one to do so.