Thanks for the reply but please check the article:
Sealed Sender is Flawed
Signal has a flawed system called “Sealed Sender”, which encrypts the metadata of who sent the message inside the encrypted packets. However, cybersecurity researchers from the University of Colorado Boulder, Boston University, George Washington University, and U.S. Naval Academy, found that Sealed Sender could be compromised by a malicious cloud host in as few as 5 messages to reveal who is communicating with who. In this paper published by NDSS, headed by Ian Martiny, these researchers found that Signal’s “read receipts”, which lets the sender know that the receiver got the message can be used as an attack vector to analyze traffic because it sends data packets right back to the sender. Therefore, our recommendation to increase metadata protection is turn off read receipts, which can be toggled in the security settings.
Source used: Improving Signal’s Sealed Sender Ian Martiny∗, Gabriel Kaptchuk†, Adam Aviv‡, Dan Roche§, Eric Wustrow∗ ∗, {ian.martiny, ewust}@colorado.edu †Boston University, [email protected] ‡George Washington University, [email protected] §U.S. Naval Avademy, [email protected]
https://www.ndss-symposium.org/ndss-paper/improving-signals-sealed-sender/ & Paper PDF: https://www.ndss-symposium.org/wp-content/uploads/ndss2021_1C-4_24180_paper.pdf
Wow I didn't realize that Signal is run on Amazon's servers and that they contract with the CIA. This article has some interesting points to mitigate the privacy concerns of this real popular service: https://simplifiedprivacy.com/signal-messenger-guide-to-avoid-privacy-mistakes/
Yes Session trades forward secrecy away in return for uncensored identity. These are pros/cons of different approaches and we provide educational material on a variety of software