is there a EU App Store that developers sign up for? no.I don't know if you're aware of this, but decisions made by a United States court mean nothing in the European Union. Apple can only take measures that are "strictly necessary and proportionate" and "duly justified by the gatekeeper" which simply isn't the case here. Apple's decision will be blocked without hesitation, since there's no evidence that Epic Games endangers "the integrity of the hardware or operating system"
if the EU wants to go as far as forcing Apple to give Epic a developer account because of the DMA, that's fine, it will go through the courts for years ....