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The New Audi A3 Is Amess With In-Car Subscriptions
(www.motor1.com)
This is a most excellent place for technology news and articles.
The Dutch article that they look to doesn't say what they think it says. In Netherlands there are legal implications to change the amount of power of engine after it is sold.
The article doesn't is solely about engine power. Not about any other subscription option to enable something.
I also wouldn't see how a stupid subscription would be banned by some EU law. Aside from e.g. engine power.