I paid more for my public health insurance than some of the most premium plans in US and I still needed to pay out of pocket when my cervical spine gave up and I was in pain for months. I would need to wait 2-3 years to get it done by public healthcare even though I contributed to it 20x what an average earner has.
There is no chance EU attracts any kind of talent with policies like those. Maybe Switzerland (reasonable taxes and health insurance independent of your income) or countries like Cyprus. Old EU is all about sucking out all you produce and giving it to others. Great deal if you are a pensioner or government worker, not so much when you are someone who can generate a lot of income yourself.
I, an individual contributor, have the same HDHP that the CEO does-- with maxxed-out HSA of course.
You're still gambling.
Cancer is either treatable or not. You either get cured or you die, and I don't care if I die broke. If it is curable I'll pay for it. If it is incurable, I'll go broke: so what?
That being said if I lived in Europe I'd have to hope that a football star is willing to auction his shoes to fund my trip to the US for treatment and I don't want that.
Generally, most of these cases where people are raising money to travel for treatment are about... dubious treatment which your insurance probably doesn't cover either. Evidence-based cancer treatment is of course available in Europe.