It's probably more that non-game-dev-Swedes actually make significantly closer to what game-dev-Swedes make in general. Regular software engineering jobs have pretty inflated salaries in the States - Swedish take home salary for software engineers (and indeed, much of the rest of the Western world) is about 1/3 of the equivalent USA salary. Obviously there are other factors at play here, like the functioning healthcare system and social safety net, but all other factors aside the take home pay for non game dev engineers is significantly inflated in the States compared to the rest of the world.

I'm pretty sure that at least in the states, game dev jobs pay somewhat mediocre. Looking at Rockstar and Activision's job posting, even for senior level stuff they're paying considerably less than some of the more unsexy senior engineering jobs.

As I said, I've never worked game dev, but people who have here told me that they are pretty brutal, expecting you to work a lot of extra unpaid hours. It would not surprise me if Sweden has better labor protections in this regard.