We are talking about immigrants, not US citizens. If you come to the US in the normal H-1B to green card pipeline, your employer decides where you are allowed to live. Which is usually in an area with very expensive housing.
You have more options once you get a green card. But with the initial uncertainty and delays in getting H-1B, the employer choosing not to sponsor a green card immediately, and the years of bureaucracy for getting the green card, that can easily be a decade after the initial offer. Which is plenty for people who don't particularly like the American culture to decide to go to somewhere with lower salaries, lower costs, and more freedom to make your own choices.
You are comparing the most expensive area in Finland to areas you consider cheap in the US. But from a Finnish immigrant's perspective, the reasonable comparison would be the opposite. You are forced to live in an expensive area in the US, but if you return to Finland, you can choose a cheaper city. €100k/year would be close to the median for a family with kids in Helsinki but a pretty good income in other cities.
You have more options once you get a green card. But with the initial uncertainty and delays in getting H-1B, the employer choosing not to sponsor a green card immediately, and the years of bureaucracy for getting the green card, that can easily be a decade after the initial offer. Which is plenty for people who don't particularly like the American culture to decide to go to somewhere with lower salaries, lower costs, and more freedom to make your own choices.
You are comparing the most expensive area in Finland to areas you consider cheap in the US. But from a Finnish immigrant's perspective, the reasonable comparison would be the opposite. You are forced to live in an expensive area in the US, but if you return to Finland, you can choose a cheaper city. €100k/year would be close to the median for a family with kids in Helsinki but a pretty good income in other cities.