It wasn't that long ago that FAANG got caught for rigging the labour market: https://en.wikipedia.org/wiki/High-Tech_Employee_Antitrust_L...

Obviously FAANG (and most companies) want to pay as little as possible for their labour. They don't pay $500,000 for senior engineers because of their innate generosity and desire to pay them well. They pay that much because they have to if they want to attract and retain the employees they are looking for.