Taxes and laws are oppression, not job offers on a free market.
So if I give you a choice between death by gunshot or death by hanging... that's not oppression, right? As long as you've got a choice, it's not oppression, right?
That is only an analogy if the employer in the first statement is offering a job and then banning the potential employee from doing anything else. Criminal A, in offering a choice between a gunshot or hanging to Victim B, is kind of like a Government A that offering choices to Employer B, either employ people at a particular wage Government A approves of or don't employ anyone at all.
In both cases, the A's oppression stems from the forceful limiting of B's liberty. Which is exactly how it works in the real world with sweatshops. The native people have had their lands removed from their ownership, therefore they have the option to do the only job available (work in a sweatshop) or die by starvation.