The depletion of tech workers for Amazon is similar. The part that isn't said is: at the salaries Amazon is willing to pay. Amazon has a different market to worry about, the stock market. They can't just increase their HR spend 25% without taking a hit in the stock market. And I guess they aren't willing to change the work environment to be more attractive. Maybe they can't at their size, as it can be hard to avoid dead weight.
Google doesn't hire in the US for some PAs, for similar reason. Salaries are capped (artificially) by stock market demands. But Google doesn't call it worker depletion.