A source would be useful for this please.
There is no good reason for Apple to throw their toys out of the pram in such a rich large market.
Sure, take your pick, this has hardly been a secret:

Meta, Apple snub EU’s AI Pact
Pledge loses steam ahead of launch as some firms turn to denouncing Europe’s regulatory hurdles on AI.


Apple Intelligence rules out 2024 EU launch over antitrust laws
The decision is due to the EU's Digital Markets Act which requires devices to be able to work across all platforms, including competing producers.


Apple delays launch of AI-powered features in Europe, blaming EU rules
Apple says competition rules that require functionality with rival products would compromise privacy and security

Apple rejects new AI pact in EU, despite support from OpenAI, Google, more - 9to5Mac
Apple has refused to sign a new AI pact in the EU, despite it receiving support from several other major AI players like Google and OpenAI.

In fact, just type 'Apple AI EU' into your search engine of choice. Even from the horse's mouth if you scroll down to the section on the EU:
How to get Apple Intelligence - Apple Support (BW)
Apple Intelligence is the personal intelligence system that helps you communicate, work, and express yourself. It combines generative models with your personal context to deliver intelligence that is most useful and relevant to you, while protecting your privacy.
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