IE like Crypto AG:
In 2020, it was revealed that the Swiss company, Crypto AG, which provided secure communications services to ~120 governments throughout the 20th century, was secretly ran by the CIA and West German Intelligence. The CIA and later NSA were able to read encrypted communications for many countries such as Saudi Arabia, Iran, Italy, Indonesia, Iraq, Libya, Jordan and South Korea.
Be careful of accepting some of the criticism of Signal in this thread. For most of us, we have to make choices about secure comms from subject matter experts. Almost all the criticism I see of Signal comes from anonymous or otherwise random users online. If you believe in such a thing as expertise, please seek it out when evaluating something like this.
It is absolutely irrelevant who makes the criticism, what needs to be addressed is the criticism itself. If somebody gives you advice to simply trust people blindly then you should be very suspicious of their motivations.
Who are the experts, and who pays their salaries? Crypto AG wasn’t lacking in experts.
You’ll have to make your own determinations I guess, but be careful if you find yourself dismissing expertise in favor of opinion or motivated reasoning.