Sort of - the original developers made a game which failed commercially and they decided to sell their tools instead. But the engine has changed a lot since tho

Sort of - the original developers made a game which failed commercially and they decided to sell their tools instead. But the engine has changed a lot since those days, and Unity's lack of real dog fooding is a common complaint from people who use it professionally. Unity don't see the problems that only come up when you try to ship a real game in a team, on console or mobile in particular.