I think sometimes its also the ilusion of safety. An european company can fire you basically at will in Denmark - its just not often people get fired unless the company is struggling a lot. But it can happen. I saw the case personally with someone getting fired because the manager didnt like him even though he worked well in a local company and no one beats and eye.
The american companies here still have at least some local managers. So perhaps theres some meetings a bit late sometimes but other than that its the same as a local company. Except you get paid way more for the same job.
And since they follow the same laws and regulations as any orher local company I think its better off to work for these. In the event you get fired you got some extra money by working in one and can get another job in another one after.
Everyone or almost everyone is in an union here. My point was these statistics that come from the union are very reliable so when I say american companies pay 30-80% more consistently here it is quite accurate. Its not some online poll or something I have heard.
My point still stands that while laws and welfare are different in the US when an american company comes to Europe it must follow its local laws. At that point its the same as a local one but chooses to pay way more.
There is a clear difference in pay between american and non american companies here and that I think can only be attributed to american companies choosing to pay more to attract talent and european ones being more relaxed and pay average attracting more average talent. I think this is a cultural thing where the US is a more competitive country and benefits us (developers).