The very drawback of these apps is that you have to have each side of the conversation using them, and that's not going to happen often.
I see no point to them, really, just because the nature of my texts and phone calls are so utterly innocuous. If I were discussing trade secrets, corporate planning that would be very damaging were it to get out, or something of a similarly private nature I'd probably insist that my communication partner be using something like this due to the sensitive nature of the information being exchanged.
I just don't think that anyone is really interested about whether I'm getting together with friends on a Friday night. Even if every last one of my texts and/or calls were to be passed through some sort of electronic screening I doubt that any of them would ever be passed on for actual human examination. I also don't think that I am being perpetually watched intensively in any way, nor are the vast majority of people.
The above being said, I have nothing against using end-to-end encryption if that is something you want to do. I just don't feel the need for myself.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain