"This is so shitty that the nicest thing that can be said is it's not actually illegal" doesn't merit the exculpatory nature of this sentence. And the sentiment behind it isn't really worth much in the first place.
We dont know how much the coders were making.
Much of that depends on specifics. Some of these devs traveled. Any work done while in other jurisdictions must have been done at local minimum wages. It doesn't take many days spent on the road promoting KSP in the US before you are legally entitled to more.
There are prosecuted cases of offshore firms sending below-minimum workers into the US. It is a crime.
(From British Columbia, a typical such jurisdiction.)
"If a third party is or will be indebted to a person who is required to pay money under a determination, the Branch may demand that the third party pay all or part of their indebtedness directly to the Branch."
"The Branch may seize personal or business assets of a person required to pay under a determination, settlement agreement or order to satisfy the amount owing and the costs of the seizure. The Branch may direct the Court Bailiff to seize assets to recover the amount owing. "
http://www2.gov.bc.ca/gov/content/employment-business/employ...
The devs agreed voluntarily to accept this salary for a number of years. It is not ours to judge whether this it was too small, because for them it was not (until now)
Likewise, if you insist on "this salary is too small for them", you're saying that you know better what's good for them than they themselves. I would find that offensive.
As yearly salary it is indeed atrocious. Still, worth saying, not an illegal salary. But yeah, I don't see many people enticed to work for that amount for a for-profit company they don't have significant ownership of. The point is not on whether or not it is advisable to resign in those conditions (of course it is), but on whether it is viable to sue (I doubt it is).
And... many people in Mexico do make minimum wage (around 13% of the country does), but usually not anyone in a specialized profession in a city.