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This is naive, IMO. Even if the app store was run differently, say allowing a competing way of installing apps, Apple still have plenty of fungible power to make such deals. You might have ticked a box to make it technically fair, for some definition of, but that would probably be just cosmetic. IE, app store would still represent most revenue and everyone is in the same position but a few geeks. The "platform game"…
An alternative market would create pressure on Apple. If Netflix tells the App store to go screw themselves and lists on a different store, then the App Store gets that much less traffic and either has to compete or lose out.
Netflix does not need to go to a different store. They're influential enough to negotiate. Apple would cut them the discount, like now, and they wouldn't. The other store will not have enough users to make the reduced fees worth ditching the app store.
If there was enough competition, most of the app store profits would dissipate. That's what competition does. Users wouldn't pay 20-30%'extra to have apple's stamp, prices would fall and the business model is gone.
No little tickbox rule will make a competitive market in app stores. These markets are structured by nature. That's why platforms are so powerful.