Yeah because Signal is big tech spyware. There is no "hack", it is collussion.

This is well known. The only thing secure is end to end encryption when you actually encrypt a message, send it as so, and the receiving person knows how to decrypt it. In the San Bernardino case they hired a private company to open an IPhone and it took a long time and a lot of money but I’m sure if they did it once they could do it again.

F.Y.I.
It’s Time To Quit The Smartphone 
https://www.rooshv.com/its-time-to-quit-the-smartphone

This was known when Snowden was still at the NSA, so I'm not exactly surprised.

In Nineteen Eighty four Orwell mused the only safe and secure place was the place between your ears.

For privacy, don't use the Internet. Just don't.

Signal is supported by Twitter, I would not trust it. Big tech hands all over it

Nothing is 100% safe when one is online.

This is common knowledge: for the past 10 years, all encryption algorithms have been illegal unless a universal key is stored with the authorities.

They watch me through my phone camera, and listen too. They can use the phone IMEI and don't require the sim to be in. It was designed to watch you no matter which way your phone is down. They are able to zoom into anything that gets in the lens. Web cameras and smart TV's are also hacked through wifi.
I literally talk to government when I look at my phone. All of them at once.

If you want a great series where this type of spy tech is depicted check out the series Colony on Netflix Brittany! They literary have screens where they can see everything you do online and every email or whatsapp message! We are all an open book!!!!!