Your point doesn't change mine, the parent said you have to know about the world you're disrupting, for example the taxi world (my example). But you don't have

Your point doesn't change mine, the parent said you have to know about the world you're disrupting, for example the taxi world (my example). But you don't have to know anything about the taxi world to make a taxi app (as you put it) and a ten billion dollar company around it. You don't need to "live in" the industry or sector you're disrupting.