> Why not use open protocols like DeltaChat, Matrix or XMPP instead?
Because Signal and WhatsApp are text/messanger replacements and Matrix is a slack/discord replacement? I'm not sure why there's the constant Signal vs Matrix battle here on HN, I see them as different tools doing different things. I'm not going to create or get all my friends to join a server with Matrix. Or even coworkers or random acquaintances I meet. But I can get their phone number and quickly communicate with them on Signal/WA. I don't see why Signal and Matrix have to be in competition. Just the same way I don't see Slack/Discord in competition with Text Messaging or FB Messenger.
I don't see why they would complement themselves, and especially why you put Matrix into the slack/discord corner: Matrix is a protocol that is not designed to a specific use case.
Because Signal and WhatsApp are text/messanger replacements and Matrix is a slack/discord replacement? I'm not sure why there's the constant Signal vs Matrix battle here on HN, I see them as different tools doing different things. I'm not going to create or get all my friends to join a server with Matrix. Or even coworkers or random acquaintances I meet. But I can get their phone number and quickly communicate with them on Signal/WA. I don't see why Signal and Matrix have to be in competition. Just the same way I don't see Slack/Discord in competition with Text Messaging or FB Messenger.