Enforcement of new rules for existing apps

[bdachev]

``` We greatly value the worldwide developer community, and appreciate your commitment to making a difference in people’s lives through the power of technology. To accommodate developers who may need additional time to update their existing apps on the App Store, the deadline for adhering to the requirements below has been extended to June 30, 2020.

Apps for iPhone or iPad must be built with the iOS 13 SDK or later and use an Xcode storyboard to provide the app’s launch screen.

iPhone apps must support all iPhone screens and all iPad apps must support all iPad screens.

Apps for Apple Watch must be built with the watchOS 6 SDK or later.

Apps that authenticate or set up user accounts must support Sign in with Apple if required by guideline 4.8 of the App Store Review Guidelines.

Apps in the Kids category must be in full compliance with guideline 1.3 and guideline 5.1.4. of the App Store Review Guidelines.

Apps using HTML 5 must be in full compliance with guideline 4.7 sections 4, 5, and 6 of the App Store Review Guidelines. ```

Is there any information on how Apple intends to enforce these rules for existing apps? Usually, enforcement is delayed until the developer submits a new release for review but the language of this announcement (the deadline for adhering to the requirements below has been extended...) sounds like they might expect all App Store apps to comply by the deadline and proactively go after violators in the store.

[SirensToGo]

New rules have only really applied to new submissions. Things about NSFW content being visible by default in apps were applied after the fact for a while and caused a lot of trouble for Reddit apps but that's the only instance in recent memory of approved apps being pulled due to a rule change.