The only one earning more than 10M who I know of is a senpai of mine who quit and got a remote Silicon Valley job. It’s a lucrative deal as you can live affordably in Tokyo. (Still, I suspect they’d pay remote workers somewhat worse...) As for myself, I wouldn’t move for 15M. The present-day U.S. sounds a great place to earn money as a SE, but it doesn’t sound like a good place to live.