It's needlessly pedantic, the navigation says "More countries coming soon". OP's submission headline is editorialised and I guess most people understand what to expect.
Only if you ignore the cost of moving, which is enormous. Basically dropping your whole life to get maybe 20k€ more, abroad. If you are happy with your life, not even 150k€ would justify a move because good money ain't going to buy you the same friends and family.
I don't understand what you mean by enormous costs. Yes, permanent moving is not exactly cheap, but it depends very much on the individual's life situation: age, social connections, home ownership, having a car, furniture all matters and all differs. Based on this one might move with a single backpack or it might take a few months to prepare.
Most companies are happy to pay your relocation costs and / or get you a place till you find one on your own.
You can also fly rather cheaply if you miss your family, so this reads very weird to me.
I couldn't give a rat's ass about relocation costs, or furniture, or even home ownership tbh. Those are all relatively minimal costs.
But if you have a nice life, a nice social circle of friends, ...etc, do not take all that for granted. You won't magically get all that back once you move. You probably never will to be honest. You will meet other people but building a social life from scratch in a new country is hard and you will end up with a lot of shallow relationships, or maybe nothing at all.
But it really depends on your personal situation. If you are a 20 year old nerd with barely any social life to begin with, go ahead. It might even improve your life.
I'm a 39 years old nerd and I really have very little to hold me up here. Who says that building a social life is easy? I did that before too when I moved to the capital from my hometown at the age of 26, I barely knew anybody. I did that twice after that for shorter periods of time, totally works. Follow your interests and pals/friends will come.
I don't agree to generalize over Europe if you cherry-pick the few specific places where the 1% of the (top paying) jobs in the continent are.
If we cherry pick, we might as well be specific. It's why we refer to SV wages and not US wages. The difference is massive.
Europe tech wages as a whole, as pretty shit overall.