Unfortunately I just learned this today. I play games on my phone seldomly, and among those games is Skullgirls Mobile. I haven’t updated my app, so its running version 1.6.0. The game has locked me out, telling me to update the game at startup, but the LINE Skullgirls app is gone from the App Store - so there’s nothing to grab from. I’ve only linked my Gmail Account and never registered for LINE, so am I assed out of the new version? There’s no way to prove what data I had, and it looks like LINE Account Data is the only way to migrate correctly. It’ll be a bummer if that’s the case, I had put a decent amount of time into the game.