My take is that there is just a lot of money in the tech sector in the US. The larger “English-speaking” market makes it easier for businesses to make it there. Whereas in Europe, your addressable market is much smaller, and if you venture into other countries, you’d have to deal with another language/culture/bureaucracies/laws etc.
However, current day tech companies that can potentially address a global market from wherever(Europe for argument) are in a spot where they need to compete against US labour. I for one get paid significantly higher than what you posted in NL. It’s just that the average includes local markets and lower pay(or really pay online with other local jobs) in Europe.
There are always exceptions- San Francisco salary should not be compared to Amsterdam for example - cost and style of living is very different. I pay €3 for a cappuccino and not $8 :-) I pay €600 for my kids day care whereas in SF it is definitely substantially more. I can buy a family home for €700K here, whereas in SF I can probably get a garage for that… you get the point.
If one is single, and many of these perks don’t apply, US is the best place to be and make a shit ton of money and all the connections. Once the perks start to make sense, Europe it is.