Earlier quoted context omitted.
> why the developer would bother with their own store if the App Store now allows emulators The keyword is now allows emulators. They didn't allow it 3 weeks ago. Or a year ago. Or 10 years ago. Only now , with alternative stores launching and offering this, Apple has finally allowed emulators. Perhaps the developer doesn't want to be beholden to Apple's whims? Especially after investing a lot of effort into setting…
Could you point at what part of the old rules was forbidding emulators?
The rules forbid running arbitrary/user-loaded code and copyright forbids bundling the ROMs people wanted to use.
The new rules have an exception for specifically emulators