The Signal messenger and protocol.

I would say Signal should not be slow on the things they are proud the most. SimpleX still better on this.

Telegram is only slightly more private than Facebook Messenger. Not only can they link a username to a phone number, but they can link a phone number to a username too.

Meanwhile, Signal did it right.

And that's before we start talking about all the problems made in Telegram, from rolling their own encryption to telling their users not to use it.

Telegram doesn’t have this to such an extent. If someone has your number in their contacts and you join Telegram they see you whether you want it or not. Signal (now) hides that too.