Messaging protocols are useful even if everyone is not on the same app. In the past I was chatting with my google using friend via some third party jabber server where I had an account. It was useful and didn't require us to be "in the same app". We both were using both different apps and different server providers.
replyBut actual protocols are so last century. You might have to think ahead for fifteen minutes because the design has to be staaaa-a-ble. It's haa-a-ard! And you can't sell out to somebody who'll change it and have an exit event.
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