And the fact that it costs them a fair amount of money to host large instances of slack. Can't seem to find the link, but you can see they will give discounts

And the fact that it costs them a fair amount of money to host large instances of slack. Can't seem to find the link, but you can see they will give discounts for non profits, up to 250 users. - https://get.slack.help/hc/en-us/articles/204368833 https://get.slack.help/hc/en-us/articles/204368833 Its a poor medium, as it locks projects into a walled garden ecosystem.