Along the same lines, how would this affect an email client that connects to a paid email service? Would be accessing content purchased outside the device?
If Apple really does go so far as to claim that then someone needs to challenge them on it legally, this is going too far. Or maybe we need a $.99 boycot or something, not buying apps.
Speaking of paid email services, there's no way to subscribe to Mobile Me with an in-app purchase. If Apple cared about fairly enforcing the rules, they'd yank iDisk and Find My iPhone until in-app subscription to Mobile Me was added.
A small quibble: the Find My iPhone service is free for all iPhone4 (maybe all?) owners. That is a good point though, although the rule doesn't come into effect until June.