Instead of getting good at 1 big tech job making 300k in 20-30 hours a week you get good at 2-3 and make 800k+ in 60 hours a week.
Though I think the actual best way to optimize labor-to-income is F500 Cloud SRE via B2B contract, but its hard to have to balls to pivot to that after spending so long perfecting SWE interview skills.