When you load an app on your own iOS device with a free developer account, that app will fail to open (as in be revoked) after seven days unless you refresh it from a Mac (or Windows system with AltStore or similar).

Guessing here, but I suspect they are referring to the revocation of the enterprise signing certificates used by gray-market iOS app stores, since native app emulators could only be distributed that way until now.

It's whack-a-mole- the stores sign their executables with a new certificate, Apple finds out about it, revokes the certificate. When that happens, I imagine the software signed by that certificate will no longer run on the devices the software was installed to.

I assume they’re referring to when the App Store revoked everyone’s emulator apps. For Apple to break these they’d probably need to remove standard web APIs.