jarfil

You'll have a chance to ask that v25 itself when it posts an AmA...

Federal taxes are only part of it, the total income taxes in Zurich are 21.6% (for $550K), so you'd have to subtract another $131K. Then keep in mind it's been 2 years since it's release. I'd say overall it's probably more than $100K/year, but not all that much more.

how could they possibly know

This is a reason for computerized expert systems to become more popular. No person can hold all human knowledge at once, but a computer can.

Because then you don't know whether it's "assigned female", "trans female", or what.

For pulse they're 100% accurate, any phone with a LED and a camera can do it. As for ox, it would depend on the IR LED, detector, and correction they're using, but should be accurate enough to notice whether you're dropping from 95% to 80%.