Why would anyone be extradited ? Did they violate some international law ?

OP likely meant deported due to lapse of valid citizenship status, not extradited.

The spirit of what was stated is correct. H-1B workers have very low employment mobility and employers know and leverage this as much as they can.

Completely incorrect. H1 employees in SV have a lot of mobility as there are hundreds of thousands of jobs available that sponsor your visa. And your visa can be transferred under 15 days. You don’t even have to quit your previous employer before your approval in place. SV companies have 20-40% attrition rate and a large portion of that is H1 employees moving around