Wow, someone sent out of their way to write about protocols. Instead of saying “thank you” or being silent or even doing independent research, you decided to talk about your paranoia. That’s interesting…

Every single thing the person wrote about is a protocol. Each has been written about extensively and they’re open source. You can read source code if you’d like.

Those are the best guarantees you can get with any software. If you’re not technical and not willing to do the research and put in the work, there’s nothing you can do.