Of the population that attends law school, passes the bar exam, and practices law, very few end up as corporate lawyers. And fewer still make multiple millions per year. You're comparing a very broad class (SV engineers) to an extremely small class (corporate lawyers who make $XM per year).

It may be fair to say that the pay ceiling is higher for the best-paid lawyers than it is for the best-paid engineers. However, engineers can reach the same pay or much higher by taking on a management role -- CTO, technical co-founder, small business owner, etc. -- at which point, IMO, they typically cease to be engineer.

Investment banking & hedge funds are another matter, and the compensation can be ridiculous.

From Glassdoor:

- Google corporate counsel ($188k salary, $215k with bonus)

- Amazon corporate counsel ($180k salary, $250k with bonus)

- Microsoft attorney ($164k salary, $224k with bonus)