Quite frankly the "all your money will go to healthcare" meme doesn't really apply to the kind of person who's leaving Canada for a much high-paying US tech job. A person like that will in all likelihood be working for an employer that offers access to equal or _better_ health insurance than they would have access to in Canada. If it's a big tech company the employer will pay virtually all of the premiums beyond some token amount, and out-of-pocket maximums are dramatically lower than the incremental pay raise. And even if the employer didn't pay that, the premiums would still be dwarfed by the pay raise.

Rent is certainly higher in the Bay Area, though less higher now vs. a year ago, and even so, at the income levels we're talking here (especially if going to FAANG or a unicorn), there is very little chance you'll end up with less disposable income after rent and health care.

If you want to buy a property, you have your work cut out for you since real estate is insanely expensive, though. It's not too hard if you're a dual-income high earner couple but very hard otherwise and will take a number of years of savings. This is worse than the Vancouver/Toronto housing markets, but it's less worse than you think given how crazy they are now.