"Spammy" or not, A policy like this one is pretty subjective, and therefore can be used by the app store owners to reject whatever they wish, to cut competition off for example..

Google and Apple not only are the owners of the app stores, but also are publishers of applications onto those same stores.. giving a pretty bad conflict of interests .. that may be a bad news for people innovating in areas were you will have to compete with them..

Imagine if this was happening in the nineties, what Microsoft would have done with Netscape back then, with all this power, to let or not let the users of windows to choose what they want to install or not?

Im pretty sure the "app censorship switch" will get used here and there.. and this policy is just a example of a hole they could use for this reason