Can you record the sound? I’ve never heard of a power supply having any kind of noisemaker. It’s probably just electrical interference or coil whine or something, where the waveform happens to produce that periodic sound. (You might even look around and find a nearby device changing its power draw with the same periodicity.)
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.
Probably, but exactly what you do would depend on your exact model. I would get the technical service manual for your vehicle, find the part about replacing that module, and follow the directions to remove it.
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.