You are getting a lot of critical responses, and I hate to dog pile, but:
>Amazon/Google/etc happily pay ten times that salary
In the thread, they say Helsinki juniors start out at ~$3k/mo after taxes. In the Bay Area, let's say you are a junior at a FAANG and are getting $150k/year. This works out to $8k/mo after taxes. So the difference between a FAANG and Helsinki is more like 3x. Maybe, 4X if you account for bonuses/options. But it's not 10x.
Obviously, 3-4X is still a lot. If it's a choice between Helsinki and SF, SF wins hands down.
Problem is that most of the engineers working in the US are not working for a FAANG company in the Bay Area. If you look at what engineers are getting paid in places like Houston or Atlanta, you will find that juniors start at $60k/year, which is $4k/mo after taxes. That's very close to the reported $3k/mo rate for Helsinki.
There is this weird trend I noticed on HN. Whenever the subject of money comes up, people start casually quoting Bay Area numbers like they are representative of the industry as a whole. I don't think they are.