There's a considerable amount of FUD about mainstream chat apps. Like that whole kerfuffle when cellibrite said "we can read messages from signal" (if we have the phone, and the phone's not encrypted) leading to a signal dev figuring out how to hack a stingray (greykey, really), and threaten to make every phone with signal installed do that when connected.

I do wonder what these unnamed chat apps are. I assume part of the reason for not naming them is to cause more FUD.