There is nothing in the terms that says you can't do that, but that doesn't mean they won't add it later (I don't think they will). From developers' perspectiv

There is nothing in the terms that says you can't do that, but that doesn't mean they won't add it later (I don't think they will). From developers' perspective, this would severely limit distribution channels, and force them to give up 30% of revenue. Or increase their prices by 43% just for the store.