A lot of corporate gains have been at a cost of squeezing on labor resources in some form or another, either time, lower comp, higher productivity, etc. or some combination of these elements. There has been some innovation in general technology making improvements for labor but a lot is really just doing more, for less, and someone else pocketing the gains. You need look no further than AWS treatment of SEs in their PIP culture to see this.

You can only squeeze people so far until they finally step away. The only reason it's being sustained is that people don't have alternative options in many cases and are esentially forced to do it. At some point people will find other options and leave you on your feet but as long as there's a steady stream of desperate people ready to be subjugated to ridiculous working conditions, this will continue.