Earlier quoted context omitted.
I've partially degoogled, and it was certainly influenced by these kinds of discussions. The most compelling reason I have found for degoogling is to make the question "what happens if they ban me?" get the anwser "nothing much". The next most compelling reason is to protect the world from their influence. i.e. take my influence amongst my family and peers and use it to steer another small part of the world away from…
I wonder if all the people leaving Google for Fastmail will make Fastmail the next Google. It's better to diversify accounts like that, especially in the case of email, which (currently) works across providers, despite attempts by Google and Protonmail to lock users in.
Worst case, you point MX to a new platform or server you own and restore from your backup.