Do these accept cash, or only ATM cards? (The latter would link your transaction to your bank account, of course.)

What do they give? A printout of a wallet address?

I don’t have a specific suggestion, but here is what comes to mind:

• Violation of human rights and civil liberties in order to gain power over others is always justified with noble-sounding excuses like protecting people and property. The reality does not match the claim.
• Once violated, privacy of information is almost impossible to restore.
• Anything that can be abused to someone’s gain will be abused eventually, if not immediately.
• Relying on a benevolent gatekeeper (even yourself) to prevent abuse of your tech will eventually fail.
• The name V0LT Predator evokes the feeling that it’s something the world needs less of, not more.

Whenever I find myself on a fine line like the one you’re trying to walk, I consider whether I’ll look back on my life and be proud of what projects/causes/changes to the world that I advanced with the time and talents that I have.

I think you mean across the internet, but I get your point. You might want to state that in your post.

Its file sharing feature works between any supported devices, including phone-to-phone, and yes, it is intended for connections across a local network.

Why go through someone’s service when you could go direct?

https://kdeconnect.kde.org/download.html

My approach with companies that do this: Contact them, explain that I will not be giving them any money due to this aggressive anti-privacy practice, and take my business elsewhere.

In case anyone else is wondering, or simply doesn’t like reading screen shots of text, this is apparently a real report:

https://github.com/microsoft/vscode/issues/32405