That's an extremely narrow view point I'd say. In my country the government promotes the growth of existing big corporations so that there can be more jobs and infrastructure development - but this has in the end lead to a widening of gap and has essentially only made the rich even richer.
I genuinely believe promoting start ups is better for the middle class than big corporations, as usually startups pay a crazy amount of money if you ask for it compared to what a big rich corpo would give you (ironically).