The title should be qualified by jailbroken iPhones
Well, what do people expect?
If you hack a device, install proper security measures and stop bitching about the manufacturer.
Like it or loath it, Apple's default setup on those phones is secure. This stuff is totally beyond their control and it's rather unfair to suggest that it has implications for iPhones.
Apple could prevent some of this kind of nonsense by selling the damn things SIM free without ball-breaking contracts and network lock-ins.
However, in the interim, their product is an iPhone, with their software on the networks that they have agreements with, and not anything else.
That situation will only change when competition increases. We are really only starting to see the emergence of competing platforms, the iPhone has a couple of years' head-start.
Google Android, Nokia's Maemo and perhaps Palm Pré (but it's a remote perhaps) will undoubtedly shake up the market quite a lot and Apple will inevitably relax some of its policies as it will become more concerned about shifting phones and apps than getting money out of network operators.
i.e. we will quite likely see a more iPod like strategy as the touch-screen smart phone with apps becomes a more generic and widespread device.