I once had a coworker on an H1B whose green card came through and she requested to be hired on rather than continuing to work as a contractor. They ended her contract. For some corners of tech, the sweat shop vibe is the whole point, not an edge case.

https://www.anthropocenemagazine.org/2022/11/co2-emissions-from-human-respiration-in-buildings-is-surprisingly-high-a-research-team-wondered-if-hvac-could-be-unlikely-companion-to-food-production/