ao3 doesn't have an app because for it to have an app, appstore will have to approve it first. and if, hypothetically, ao3 needs appstore to approve it, it will also have to abide by appstore's pro-censorship stance and start banning dark and taboo fics, which is against its own core principle of being completely against censorship.

ao3 doesn't need an app. it works more than fine without an app. the reason ao3 can allow dark and taboo fics, the reason it can allow the most disgusting and shockingly vile fics, and be completely against censorship is because it doesn't need appstore's approval. it stands on its own as a non-profit organization with functioning site and a team of lawyers protecting its platform, its users, and every single fanwork on its platform.

everybody say thank you ao3

Gold wreath with detached stem including leaves and berries

Greek, Hellenistic Period, 300-100 B.C.

THE LORD OF THE RINGS: THE RETURN OF THE KING (2003), dir. Peter Jackson