This is ridiculous. These engineers are on >100k$ per year and could quit and get employed almost instantly elsewhere at any time. It’s not “exploitation”.
Just because they make a high salary, doesn't mean they're not exploited. Remember that wage fixing scheme where the big tech companies had been found to be suppressing wages by about 20% with mutual non solicits?
This is obviously relative. If someone generates 200k of value and gets 100k in benefit, they are being exploited for that other 100k. That's by definition, as the parent says.