Several things:

A) Apple doesn't sell a creator subscription service that's the same as what you can get from Patreon.

B) You can advertise inside of a box for services that Walmart does provide (yes, that includes devices).

C) Is your implication that if Walmart did open up a music streaming service that suddenly it would be improper for iOS to advertise Apple Music on devices purchased from Walmart? Because that's a wild thing to suggest.

D) Just re-stating B more directly: Apple advertises direct hardware purchases from the physical Apple store - a direct competitor to Walmart's tech hardware sales - for hardware that Walmart actively sells. And Apple advertises that hardware on devices and within packaging for devices that are bought from Walmart.

Apple's website homepage for the iPad has in big block letters halfway down the page: "Why Apple is the best place to buy iPad." Under Apple's rules, they would not be able to link to this page within an iOS app.

There is no equivalent to this in hardware land.

> Or if you can buy direct it is cheaper from Walmart.

I'm not going to drive over to Walmart to check this, but I severely doubt that Walmart is consistently offering all of its Apple hardware at a cheaper price than an Apple store.

> Walmart is a large enough customer that they won't let you sell it for less (either you don't undercut Walmart, or you will sell zero at Walmart).

Which is still egregious and anti-competitive! But amazingly, somehow less egregious than what Apple is doing. Ask yourself, how anti-competitive and abusive does a company have to be in order to be worse than Walmart? That's almost an accomplishment.