> It's pretty clear Epic set out to intentionally get their Apple developer account terminated so they would have standing to sue, so I would not draw too much inference from that.

Actually, it's clear that they intentionally got their _app removed_. The termination of their entire Apple account was a step I wouldn't have expected Apple to take because it underlines the fragility of their authentication system. Now, player who signed up to Fortnite on their phones can't continue to play anywhere else, probably making them regret using the Apple sign-in in the first place.

I generally consider any federated login that doesn't have an external email address attached to be fleeting, possibly disappearing out of the blue. I've lost some minor accounts when I deleted my Facebook account with services that didn't offer an email alternative. Developers, at least make adding an email/username and password optional once I've signed in with another service account, because that account might just disappear altogether one day!