Why did you choose to name the Basecamp founders, but not Slack founders? At least part of the Slack founders seem to be public figures who have had recognized

Why did you choose to name the Basecamp founders, but not Slack founders? At least part of the Slack founders seem to be public figures who have had recognized financial success when Flickr was acquired many years ago. Also, it is probably that with Slack at its current levels of investment the founders have been able to take money off the table for themselves -- that is how these big rounds seem to be structured for unicorns to remove some "distraction" for the founders.