How do you know that? (How much of your net worth are you willing to bet on it?)
Between GDPR, the DMA and now the AI Act, there is a lot of unique regulatory cross section that Apple has in the EU. It would be surprising if there weren't additional legal checks it had to do, internally and on its suppliers, before launching a product or feature in the EU.
So while you are correct that there is no technical barrier, you are incorrect that they are the same under EU regulation. Involving EU regulators in product design for designated gatekeepers was the entire point of the law, so this is the desired effect. Regulators want the flexibility to e.g. work with the gatekeeper to design feature modifications, like the default browser selection screen[2], for other aspects of designated gatekeeper platforms.
One can choose to see this as good or bad, but this is clearly the intent of the law.
1 - https://ec.europa.eu/commission/presscorner/detail/en/ip_23_...
2 - https://developer.apple.com/support/browser-choice-screen/#:....
Apple just got dinged under the DMA [1][2]. The text of the law may not have changed, but the reality of its meaning has.
> they're really doing something horribly wrong if they can't be in compliance with GDPR
The point is verifying you are in compliance with a law has costs. Plenty of start-ups, for instance, are better off geoblocking jurisdictions they don't have the resources to comply with but don't want to accidentally do something illegal in. Not because they think they're violating anything. But because it isn't worth losing (a) nimbleness over or (b) future access to. (Common ones being the EU, China and India.) Apple isn't a start-up. But they probably don't want their design team to be half staffed with lawyers either.
[1] https://www.apple.com/newsroom/2024/01/apple-announces-chang...
[2] https://www.beuc.eu/sites/default/files/publications/BEUC-X-...