> Regarding end-2-end encryption: It does not prevent a government from reading your messages anyhow. They could instruct Meta (or whichever company is in control of the app you use) to send them the the messages you write directly from your phone. Or from the phone of the receiver. Or to send them the private key from your phone. They could also ask Apple or Google to do so, since those have acceess to everything on your phone.
There is a huge difference between "use the encryption key you already have to decrypt this message" and "implement changes in your software that allow attacking this person".
Last I heard, US courts couldn't force companies into doing anything, only to reveal information, or to mandate secrecy. The idea of a warrant canary is 100% based on the idea that the government cannot force the company to publish a statement it does not wish to publish.
https://en.wikipedia.org/wiki/Warrant_canary