"Actually this is a common misconception... I do *not* in fact have a lot of time on my hands at all! I just have a very very very very bad sense of priorities."
--Dean C Engelhardt
I think (apart from the obvious anti-competitive behaviour) it's might be to do with the fact that the built-in browser can be controlled via the parental controls settings.
Not sure third-party apps have the same restrictions (never having owned an ipod/iphone, however I recently purchased one as a presentand had a brief play with it before sending it off).