They also created Flickr. Both Flickr and Slack were detours to market internal tools to outside customers on the way to making a game which never actually got

They also created Flickr. Both Flickr and Slack were detours to market internal tools to outside customers on the way to making a game which never actually got made. Why can't Stripe do the same thing? It's got this gigantic customer base of fledgling businesses; why not start building internal tools and then, once they're mature and battle-tested internally, offer them publicly to the growing businesses they already work with? It's an ingenious move.