@Elizafox Slack is doing one thing very right. Sure they're corporate and proprietary, but they are doing the simplest possible thing to make money: They are charging people to use Slack.

Having a thing that isn't free and doesn't have to have hidden privacy costs? It actually is kind of shocking given the modern web application landscape. My employer pays for Slack, and we get real value out of it, not the least of which is that Slack doesn't have to sell our data.