I have observed that when I add an email contact to my Gmail account, it also shows up in my iPhone contacts list. I don’t want email contacts under my iPhone contacts unless I have a phone number. I don’t know if iPhone is saving them or if it is something Google is doing.
I do know that no matter what I try, delete, toggle various things off or on nothing stops this. If I delete from iPhone, it also deletes the email address in my Gmail account. If I add the contact back to my Gmail account, it is also back in my iPhone contacts. I even tried hiding the Gmail stuff in iPhone contacts, and as soon as I put the email address in Gmail it was back in Contacts again.
This is beyond ridiculous. I can’t control my own contacts list. Everything I have seen in Google for help/search is old. Even the stuff from 2017 is no use.