Up until now you have been forced to use WhatsApp because all your friends use it.
Soon you can chat from Signal, Telegram, Threema, … to WhatsApp.
New EU rule: WhatsApp must open for all messengers – ZDFheute zdf.de/nac…tml
I think you will be able to write from any Messenger A to Messenger B.
So from Instagram to Signal or something. Because everyone has to stick to it. So similar to e-mail. Am curious!