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6m/year is more than median income but is nowhere near SV salary and I know tons of people living in central Tokyo on that salary.

They live in 10 square meters?

Most places <$1k USD/month seem to be 20-25 sq meters

You can easily get 20-25m² for 60-70k about 20 min from Shibuya. Not sure where you live that you think it's super expensive.