Steam

A short list of the biggest fucking games in half a dozen genres. Do you know what an outlier is? There's not just the one.

As a direct comparison: Fortnite probably installed a lot of Android copies outside the Play Store. But surely 99.9% of Android games are still installed through the Play Store. No matter how hard any particular ultra-popular game could have gone, the reality for an overwhelming majority of cases is that being outside that one store is death.