

It needs to be said. Because anonymity is only one part of privacy.
Security is another part - in messaging, this means that the message cannot be spied on in transit, and cannot be altered in transit.
Authenticity is another part - you need to know that the message came from who it claims to have come from, and not elsewhere.
Signal does not provide anonymity, basically. But it guarantees security and authenticity beyond doubt. And this is useful - you can exchange secure information with people using Signal, knowing that it’s not being spied on or altered, knowing that only the person you intend to see the data can see it, and knowing that they know that you sent it.
But yeah, if you want to send messages anonymously, other services are necessary.
Signal is the best intersection of genuine security and ease-of-use that I’ve ever seen. No choosing a server, no making an account. Just install the app, get a confirmation SMS, and now you can communicate with future-proof encryption and authentication right away.
For more technical people, who aren’t going to be intimidated by things like making accounts and secure passwords and choosing servers, Signal is not the best. But when I need to communicate securely with non-technical people, it’s a wonderful quick go-to solution.