Fastmail provides an easy way to migrate [0]. I setup a label in my Fastmail account that will tag all mail coming in from Gmail. Then you go through that list at your leisure and make the requisite contact with the people or services emailing at the old address. It's really not difficult at all. I've been on Fastmail for ~4 years now, and haven't once considered looking back or regretted it. Good luck.

[0] https://www.fastmail.com/features/migrate/

Postgres supports the Foreign Data Wrapper concept from SQL/MED. If you configure this you can do joins across instances, even!

https://www.postgresql.org/docs/current/postgres-fdw.html

So if they are using information people freely share to social media sites as the seeds for their investigatory and enforcement actions it follows that there is a simple trick people can employ or minimize their effectiveness.

https://signal.org/download/

They do, but some seem to be gradually removing functionality (like check deposit via scan + upload) in favor of using their amazingly convenient (/s) app.

Admittedly, that part was a bit tongue in cheek. Rather, I wish that is "what one does now", as I think we might live in a somewhat nicer world rather than one driven by whatever has been happening as many of us get sucked into our algorithmically-driven feeds across various web properties and apps.

Also, fwiw, you can install Play Services after installing GrapheneOS[0]. It runs in a sandbox without the same deep system access that it has on less secure versions of Android. There's no requirement here to authenticate with any Google account. You'd just have the Play Services running/available, which can be a requirement for some apps.

[0] https://grapheneos.org/features#sandboxed-google-play