You should remember that according to a court testimony the whole European area (which goes beyond EU) gives Apple 7% of their revenue, whereas breaking DMCA may incur penalties of ups to 10% of global turnover.
Those numbers make withholding "risky" products a no-brainer strategy. Also, those numbers put a hard limit of how much Apple will want reevaluate their general strategy of tightly integrated first-party software.
Which court testimony are you talking about? A quick google search suggests that Europe is responsible for roughly 25% of their revenue.
Edit: 26% of their net sales comes from Europe for Q1: https://www.apple.com/newsroom/pdfs/fy2026-q1/FY26_Q1_Consol...
Why do you keep bringing up DMCA?
> The Digital Millennium Copyright Act is a 1998 United States copyright law
The DMCA is a law in the United States, it's not related in any way to Apple's decision to not roll out Siri in the EU.