The idea that a startup's end game should be to "build a monopoly" is one of the most profound insights in Thiel's excellent book, Zero to One. This move just deepens YC's monopoly in its domain, as sama would say, "in the Peter Thiel sense."
Which was an insight in Blue Ocean Strategy (Kim & Mauborgne, 2005).
And before that, if you squint, in Competitive Strategy (Porter, 1980) and Competitive Advantage (Porter, 1980).
And the B-school theorists basically got their ideas by peeking over the fence of the Economics dept at how monopolies are formed and abuse their power and saying "hey, let's teach that to our students".