There's a strong chance this will be shot down as "bad-faith" compliance. Rumor is Epic will quickly contest it [Update: confirmed] https://twitter.com/timsweeneyepic/status/174740814726057173...
The main thing that feels icky to me is the hurdles to getting approved to link to alternative payment methods, but even if those are walked back that doesn't solve the main issue, which is that alternative payment providers were never a sensible solution to Apple's tax.
Apple has always argued that the commission is for the App Store, not for payment processing, and it is only collected through their payment processor as a matter of convenience. The policy announced here is essentially the same that they announced two years ago in the Netherlands in response to a similar ruling [0]. I'm surprised that anyone here is surprised that they're doing the same thing in the US.