Hi,
- Yes
- Google may have, and I just clicked a link myself today in a 2024 email thinking there might be a “manage your subscriptions” page. (Haven’t received any in 2025)
- No.
Some probably pertinent information:
My wayfarer emails come to [user.name]@gmail.com whereas my PoGo marketing emails (used to) come to [username]@gmail.com despite being registered using the same Google login.
Edit: I also had problems linking a Pokemon Trainer central account because it had to be created with the (wrong, but still functional) email on file. Somehow I figured that out.