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by em-bee 134 days ago
wasn't slack initially built on top of IRC? they had at least support for IRC clients, much like google message or however it was called at the time used to support jabber/XMPP clients.

well, there is another alternative, namely the EU laws forcing interoperability. i don't know if they have passed yet, or how likely it is that they will pass, but i seem to remember a recent announcement of one system going to be interoperable with whatsapp.