[jamesmishra]

When Uber trialed Slack in 2015, there were clear performance issues. Uber was aware of the potential issues ahead of time and slowly onboarded individual teams. As the onboarding went on, functionality like searching for an individual user clearly deteriorated.

I left Uber before the late 2017 Slack test, so I know nothing about it, but I think "It costs too much" is a very fair objection to using a chat app, especially for an unprofitable company that would have to pay for >30k seats.

At this point, I'm sure that Slack has resolved these performance issues for the sake of onboarding all companies that are Uber-sized or larger.