I think the sort of person FAANG wants to hire, knows how much they can get from moving and has either already relocated or found remote work.

They do. At least some of the FAANG have important software development offices in Japan.

Because any good talent leaves Japan immediately for the USA as soon as they can for better pay and a more relaxed life?

Yeah, FAANG can just hire all the engineers at NTT, all these Indian IT outsourcing companies, European tech companies and other I might have missed. I mean for christ sake this is 2022. If every CRUD micro services peddler and every network engineer who solves 5 firewall opening issues in a day couldn't get USD 200K / year for 6 hr work day, free food and drinks, onsite laundry, massage, haircut and medical checkup. What is the point of even living on this polluted earth.

That's low.

In Romania FAANGs aren't paying better salaries than market average, so the only incentive to work for a FAANG is to have it on your CV, stay 2 years and find better employment.

FAANGs get it really cheap here as they pay 10x lower wages than in the US.