The apps you install expire after a week. You need to reconnect your device to a computer at least once every seven days and reinstall the custom app. Also, you're limited to three apps at a time.
It's not actually usable for anything. It's also a completely arbitrary and needlessly-punitive restriction—if I've opted in to installing custom software, why limit me to three apps at a time, and why make them only last a week? What security benefit does that provide?
I thought they used an enterprise certificate? Those are still available and easily can be used to distribute software without Apple review (but perhaps not for companies as high-profile as Facebook)
They are no longer easily available - presumably as a direct result of the Facebook incident. I'm sure there are companies still grandfathered in, but as a new entrant you'll be aggressively shunted toward either the B2B or consumer App Stores.
It's not actually usable for anything. It's also a completely arbitrary and needlessly-punitive restriction—if I've opted in to installing custom software, why limit me to three apps at a time, and why make them only last a week? What security benefit does that provide?