Antitrust/monopoly is all about how you define the market. "XX% of broad product category units" is one way to define the market, but it's not the only way and

Antitrust/monopoly is all about how you define the market. "XX% of broad product category units" is one way to define the market, but it's not the only way and it's not the 'canonical' way. Other ways could include: % of product category revenue, % of category software revenue, % of category third party developers. I'm not saying that all these alternative market definitions are more or less valid than product category units, I'm just saying that it's not cut and dry case closed because internet commenter #536864336 did a Google search comparing sales numbers between two companies.