The EU regulations and standards are likely just as annoying for them, but they don't sell the same volume across the EU yet, and the regulations are a bit more consistent across the whole region. So getting a Tesla in one EU country will work the same in another. Which is just easier for a consumer.
I am not saying this would end Tesla, but I can't imagine a world where they want it to come to that. I think they would look at either properly complying or some other workaround before just drawing a fence around FSD in CA.