Also back in November, Rob Griffiths -- a former Macworld senior editor and now part of Many Tricks -- expressed concern that several of the company's apps (Moom, Witch, and Time Sink) would simply need to get pulled from the Mac App Store entirely once the sandboxing deadline arrived. All three of those apps use the Accessibility APIs, which lets them simulate various user interactions to work their magic.
Griffiths confirmed to Macworld that, indeed, Apple has offered no new entitlements for developers to use the Accessibility APIs in a sandboxed environment. That means Many Tricks can't release any new features to those apps in the Mac App Store, only bug fixes. For major new releases, Many Tricks will return to relying on direct sales from its website instead.
For some developers, making their apps conform with the Mac App Store's sandboxing requirements would simply hamper their software too much. The developers of the popular keyboard launcher Alfred posted on their blog that "Apple's new Gatekeeper [the OS X Mountain Lion feature that prevents unsigned apps from running] paves the way for us to keep Alfred as productive as possible without having to work within the limitations of a sandbox." The company adds further: "You'll continue to find the free version of Alfred in the Mac App Store, as Apple allows existing apps to remain in the store and receive bug fixes. However, if you're looking for the big, juicy new features, your best bet is to download Alfred from our website."