What percent of "digital goods" purchases is that? Because it's definitely not 60%. Defining a category like "app purchases" seems extremely narrow and arbitrar

What percent of "digital goods" purchases is that? Because it's definitely not 60%. Defining a category like "app purchases" seems extremely narrow and arbitrary - a way to construct a product category that you can then say Apple is dominant in. What's the difference between the "app" Fornite and Fortnite on the Xbox One and why should they be treated as different product categories for the purposes of measuring market share?