Maybe the US government (or even "deep state" or something) has realized that making everyone use insecure devices for easier surveillance is as smart as forbidding fire exits so that people would be easier to arrest.

I haven't heard too many bad things about Signal.

Various dictatorships want to simply read correspondence because the social graphs producing actual value and keeping stability in our world, and also protecting their embezzled value stored abroad, are all abroad too, and they won't hurt these. Some politicians in the west want to invade privacy for the same reason - what they embezzle is stored in ways unaffected by insecure communications in their own countries.

But if you are part of some establishment, even if not well-meaning, you are interested to protect the system from outright erosion, meaning secure communications.

Other than that, WhatsApp and FB Messenger are owned by Zuck and he's become too big to tolerate, Telegram is an African brothel with no protection and plenty of diseases, and in general it's all corporate around.

Let's please also remember that there are people of various views and interests in every organization and force.