Sadly, they are all gone. Furthermore, the process of making privacy illegal is seemingly a global attempt rather than just the United States government's.
I'm not sure I would say they are gone just yet, but we are certainly heading in that direction, and people's general ambivalence about everything privacy is only hastening this. When you look at revelations from Snowden and things like the 5-, 9-, and 14-eyes, then yes, it is a clear and obvious trend across the Western world, but there is no doubt the US government is leading the way. For all we like to go on about our freedoms and look down on places like China for their lack of said freedoms, most don't realize our government is doing many of the exact same things as China's. But who cares if the government listens to all your conversations if it means you can ask your home assistant to turn the lights off because you are too lazy to stand up and do it yourself, right!?
Convincing a mass of people to stop accepting and supporting backdoors is a difficult task. Even getting Messenger users to move on to Signal is a burden.
It is difficult for sure. Changing your own habits is one thing - leaving social media, stop using Google, Microsoft, Apple products, not completing KYC, using Tor, etc. Convincing other people to start using open source encrypted messaging apps like Signal instead of backdoored WhatsApp is another thing, particularly when all
their contacts still use WhatsApp, or whatever. The herd mentality of "nothing to hide" is strong.