It would need to be stressed to only accept apks from trusted sources. Otherwise malware could spread.
Regarding internet shutdown: Wouldn't it make sense to make APKs very easy to share P2P? I guess that's a nostr:nprofile1qqs83nn04fezvsu89p8xg7axjwye2u67errat3dx2um725fs7qnrqlgppemhxue69uhkummn9ekx7mp0h3gy93 feature request, but what would obviously be beneficial is that those who have bitchat etc on their device already could easily share it with others (without internet). CC nostr:nprofile1qqs9pk20ctv9srrg9vr354p03v0rrgsqkpggh2u45va77zz4mu5p6ccpzemhxue69uhk2er9dchxummnw3ezumrpdejz7qgkwaehxw309a5xjum59ehx7um5wghxcctwvshszrnhwden5te0dehhxtnvdakz7qrxnfk
Discussion
nostr:npub10r8xl2njyepcw2zwv3a6dyufj4e4ajx86hz6v4ehu4gnpupxxp7stjt2p8 would deliver APKs along with nostr events as proof