They could, it could be a blessing for competitors in the EU.

But they won't because the EU is a huge market and money speaks, while that happens they need to comply with the laws. Stop breaking the laws and you stop being fined, it's pretty simple for multi-billion/low-trillion market cap companies, innit?

It would be terrific if this happens. Can give room for alternatives to grow in the EU. Even the rest of the world would love it.

So far only China has managed alternatives - and only thanks to govt exclusion. US behemoths just eat everyone else up - even in the global South.

You must believe that US companies are trying to enter and stay in hostile markets out of the sheer kindness of their hearts. Have you considered that not being present in the second biggest market by GDP may actually be a massive liability by creating a massive opportunity for competitors that will be far better adapted to stricter regulatory conditions? You could just as well advise US car manufacturers to stick to building cars like the Cybertruck and ignore markets that consider it unsafe.