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 your phone number and everybody else' phone number.
Now I don't think Telegram needs to "attack" Telegram: Telegram is immensely more successful and has reached take-off velocity.
To me Telegram is going after WhatsApp, not Signal.
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 your phone number and everybody else' phone number.
Now I don't think Telegram needs to "attack" Telegram: Telegram is immensely more successful and has reached take-off velocity.
To me Telegram is going after WhatsApp, not Signal.