I don't know about Telegram being nasty towards Signal but Signal brought this upon themselves. Metadata are more important than the content of the messages and yet Signal has always been about knowing your phone number, with handwaving when the subject is mentioned. Sessions, a Signal fork, had its tagline right: "Share encrypted messages, not metadata" . Signal is a metadata exchanging app and it's about collecting…
Not sure if metadata is more important but ok. Signal has launched support to use nicknames instead of phone numbers although it's true this took a long time. I think Telegram is very wide-spread for running large group chats and communities, a use case that Signal is not interested in. Personally, I want my chats end to end encrypted and I'm grateful to Signal for pioneering this and inspiring Whatsapp, facebook mes…
Wow, really? ICQ had that in 1996 ...