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.
I’d personally love to see some sort of integration with another federated chat service, like Matrix, to avoid reinventing the protocol. That said, you can already just make a matrix account and use that so I’m not sure how much value putting it directly into lemmy really adds.