> If I where them, I'd quietly ban al ethnic Chinese from working at their company.

That's a horrible and dangerous suggestion and I hope the the world is above racial profiling. Given historical precedent and the difficulty in developing extreme ultraviolet lithography, it's reasonable to expect CCP has their top hackers and human intelligence operatives (both paid an unpaid PRC nationals and non-PRC nationals of varying ethnicities) attacking ASML to try and steal its invaluable trade secrets.