There are some players with fairly deep pockets on the other side as well. Nobody on the scale of Apple or Google, perhaps, but not mom-n-pop shops either. Plus if I were Microsoft or Amazon, I would be salivating at the chance to run an alternate store on iOS and Android, so there could be some dark money flowing through K Street lobbyists for all we know.
Imagine if they could operate an Amazon (or MS) app store on an equal footing with Apple and Google themselves. And then they can pitch to app makers a 5-10% commission instead of 30%. I bet they'd get a lot of takers and maybe some popular apps would even be "Exclusively from the Amazon (or MS) Store." That would cause Apple and Google some serious discomfort.