export of the best machines should be banned before europe builds its own chip manufacturing and supply chain

How well have you thought this through? I have a lot of questions if they went this route.

Why are there no buyers as it is? Doing this would force lower margins for ASML, effectively knee-capping a Crown Jewel of European technology and business. Do you think the EU should subsidize those losses?

Could help put a stop to the AI nonsense for a while, at least.