"Apple argued that the original order was "extraordinary" and forced it to "give away free access" to Apple products and services, including intellectual property. Apple said that it should be able to collect commission on external purchase links and control the way those links look, both of which are currently prohibited. Apple claimed that keeping the App Store rules as is will cost it "hundreds of millions to billions" of dollars annually."
Give away free access? It's a computer. The primary personal computer most people use on a daily basis. Access to them has always been free (even from Apple) until Apple decided for it not to be and acted like it was somehow normal and expected.
Even on the iPhone, they have always "given away free access" to food, delivery, shopping, ride-share apps, etc. If McDonald's can let me pay with a credit card in the app without giving Apple a commission, why not Spotify or a game app? They say because one if physical and one is digital, but then never explain why that matters besides that's what they decided.
Maybe they can complain that they shouldn't have to distrubute the apps for free through the App Store servers. Fine, then charge them the actual cost Apple incurs per download (like per megabyte) if they use Apple's servers or let them use their own servers or pay external servers to distribute, kinda like they've always done with podcasts.
I'm sure Apple doesn't like the government telling them what to do for a change, but that's how it works when you get too big and act greedily. Just call the 90s and ask Microsoft.