I don’t have a specific recommendation, but you can look over the big list maintained by Reddit users: https://docs.google.com/spreadsheets/d/1ijfqfLrJWLUVBfJZ_YalVpstWsjw-JGzkvMd6u2jqEk/edit
You probably want one hosted in a non-cooperative country, and one that doesn’t keep logs.
Yes, in theory any program, including Windows itself, could upload data to the Internet if not blocked.
Windows can be restricted by a network firewall. Programs can be restricted by filesystem permissions and the OS firewall, and not running them as admin.
But is this happening? Unlikely, unless you have malware. You can inspect your traffic.
What do you mean “what psyops”? Are you unaware that both China and the US, as well as almost every other country around the world, conduct foreign influence campaigns?
And I’m sure I don’t need to give you examples of American campaigns. Most of Hollywood contributes.
Only time will tell. But you may get better info from their own forum: https://discuss.grapheneos.org/d/23080-aosp-and-pixel-device-support
Probably these: https://usa.visa.com/pay-with-visa/cards/prepaid-cards.html
That’s for the US. I don’t know about other regions.
https://developer.mozilla.org/en-US/docs/Glossary/Fingerprinting
https://amiunique.org/
https://coveryourtracks.eff.org/
There are plenty of resources for this already.