> Why would someone use a walled-garden instead of a protocol ? Because it actually works. I've tried countless of times to use Matrix with different groups of

> Why would someone use a walled-garden instead of a protocol ? Because it actually works. I've tried countless of times to use Matrix with different groups of people and every single time there comes a point after a few days where one of the participant can't read messages from another, or can't send messages anymore, etc. And that's was even the case with computer literate people (computer scientists or developers). So yes, I see your point and in a world where Matrix actually does work and is simple to self-host, your point would be entirely valid. Sadly in real life, setting up a Mattermost instance is easy and it just works, while Matrix, even without the hassle of self-hosting, doesn't.