Open source chat and open source AI just mean that the code you are looking at does not have an obvious back door. That has no bearing on run-time use and monkey-patching. As for Signal not being E2EE I already explained. I don't play the contrarian game so you will have to do your own research.
> As for Signal not being E2EE I already explained.
Either you have not, or it was wrong. It's not clear because there were a bunch of mixed up things (JavaScript has nothing to do with Signal, so I assume you were talking about the Proton web pages, and I would agree there).
> I don't play the contrarian game so you will have to do your own research.
That's not how it works: you say Signal is not E2EE, you prove it. I am convinced that it is, so from my point of view, you don't understand how it works. The only way I can help you understand is if you explain what you believe is wrong there. Google won't tell me that.