Yep. Stewart Butterfield & co. failed to develop a web-based online game, it reused parts of the game framework to create Flickr. Then, years later, he tried to create a new game, Glitch, and during development they built Slack as an internal tool. Glitch failed, Slack was spun out. He keeps trying to make games, but the universe wants him to create Internet startups instead. Third time the charm, perhaps.