I don't recognise that market. Why are these people able to get APKs without a network connection? Either way, I would imagine that the sort of market we're ta

I don't recognise that market. Why are these people able to get APKs without a network connection? Either way, I would imagine that the sort of market we're talking about here —Fortnite, an online-only game— would probably have a network connection available. And even then, signature chains would still work for strong signing the APK, even if it were installed offline.