Having run "startup within the enterprise" business units ... this is such a frustrating thing, trying something new and different, but it doesn't become massiv

Having run "startup within the enterprise" business units ... this is such a frustrating thing, trying something new and different, but it doesn't become massively profitable in under a year, so the owner/founder shuts the project down. Not remembering it took the main business unit over a decade to get where they are :-/