Those definitely cost more and have better working conditions in the UE than the US, but that's OK for McD, because the burgers flipped in the EU by the costlier workforce don't get exported worldwide, but get consumed locally and therefore all this is reflected in local prices for local consumers which have no competition from imports from abroad.
But when we talk about skilled workforce for the semi industry and the products being fungible and exported worldwide, the equation can start to flip.
Not really. The margins Nvidia earns designing their chips are far higher than what TSMC earn fibbing them. TSMC actually has coemption. Samsung are only one node behind which is just enough to drive price competition down. Meanwhile Nvidia has no competition. You wanna be where Nvidia is, not where TSMC is.
OF course, this might change in the future either way.
I don't know the exact answer, but what I'm trying to say is that there's no free lunch for employers in either location, but I'm pretty sure they do their homework on this and they know the exact answer when they decided to open up shop somewhere.