The 30 per cent store tax is a high cost in a world where game developers’ 70 per cent must cover all the cost of developing, operating, and supporting their games …
… there’s a rationale for this on console where there’s enormous investment in hardware, often sold below cost, and marketing campaigns in broad partnership with publishers. But on open platforms, 30 per cent is disproportionate to the cost of the services these stores perform, such as payment processing, download bandwidth, and customer service.
Epic Games CEO Tim Sweeney on why Fortnite won’t be featuring on the Google Play Store.
See: James Batchelor (3 August 2018) “30% store tax is a high cost,” says Sweeney as Fortnite skips Google Play, https://www.gamesindustry.biz/articles/2018-07-31-30-percent-store-tax-is-a-high-cost-says-sweeney-as-fortnite-skips-google-play