Those info sites aren’t built from bank records. They’re built from public records databases like voters, property, taxes, legal cases, and government actions, including stuff like just showing up to the city council to complain.
You could conceivably open an account in another country where they’re very private about banking info, but it wouldn’t help your case, and it would probably be a huge hassle for your day to day life.
Yes, especially in the UK, since they’re a surveillance state.
There are some things that will always get flagged on any platform. This, drugs, and connections to sanctioned countries, for example. I’ve heard of people in the US having their Venmo accounts suspended because they put “Havana” in the transaction description. Havana is a local dance club.
What are you running your containers on? I just put my VPN on the docker host so I could be sure I could use the firewall to block traffic from going out except over the VPN.
This doesn’t really have anything to do with open source software. It’s more of a privacy topic. You can harvest as much data as you want and still be GPL.
You can control who sees it by how and where you post it. If you don’t want people to see it, just don’t put it on the Internet at all. Even sites with fine-grained privacy controls can have flaws that result in information leaks.