This is fundamentally flawed logic. Best Buy and other retailers sell physical goods that consumers can use in a wide variety of places. The App Store only sells digital goods that can be used on a specific platform, and is owned by the platform holder. It is more akin to say, the PlayStation or XBox storefronts. The platform holder has full say over what is on the platform and what percentage they charge for being on it.
You could argue this should be different, but I don’t think they should be held to the same standards as retail storefronts because it is a completely different ballgame. If Apple allows other ways of apps being installed on the device, that opens up the platform to all sorts of bad actors and malware, etc which they have a vested interest in keeping off of their platform. This isn’t a concern for Best Buy.
And I say this as someone who fully supports Hey and is a paying user of their service. I do still think Apple was in the wrong in this particular instance. Hey isn’t on the App Store because they hope to get a ton of new users there. They are providing a service and doing all the marketing, sign up, billing, etc themselves. They knew they had about 100k+ people that would be interested day one, and those people would demand an iOS app. Hey doesn’t need the App Store to sell subscriptions, they just need to be available to their users on every platform.
How an email client is not a “reader” app is beyond me, but in any case Apple doesn’t look great in this scenario. I still don’t think that speaks to a larger antitrust issue or that you can really argue for a better solution vs. what they’re currently doing. Maybe the cuts should change, maybe they should be more willing to work with developers who clearly have their hearts in the right place, but letting congress sort it out is the wrong solution.