I agree this discussion has nothing to do with the post. That said, I believe that just because copyleft does not remove all possibilities of misuse of your code, I believe it prevents the vast majority of them. Like you said, this is a freedom vs security issue and the answer lies somewhere in the middle. Copyleft is that correct middle, in my opinion.
Its no theft, it’s because those companies will take your code, use it to make themselves more money, and then use that money to continue oppressing you, restricting your freedoms, and spreading anti-open source propaganda as usual. If the code was copyleft, then you wouldn’t have to worry about(or at least worry less about) such a thing happening. What I have described above is already something that has happened and continues to happen to non-copyleft open source code.
I was thinking more like “your lemmy account is already a matrix account” kind of integration, but of course that’s way more programming work than what lemmy already does(which I didn’t know about). It’s definitely cool to see matrix being treated like a sensible default though, very happy with lemmy on that decision.