&quot;Reading the comments here it seems that people are missing the point by just joining one of those instances.&quot;<p>No, they&#x27;re not. They just want to get started and go. They don&#x27;t want to deal with hosting or configuring servers. Many of them might not even have the equipment to do it. That&#x27;s the experience they&#x27;ve gotten from Twitter, and most people like that.