This is exactly the neoliberal argument against labor protections in general. People would obtain jobs with dignified pay & benefits if they could. Having an option that seems exploitative is better than having no options. Thus, imposing minimum standards on the work that can be offered is harmful. Pursue other, better mechanisms to boost and lower-bound standards of living (economic growth, negative income tax). In the meantime, don't stand in the way of mutually beneficial transactions.

This is a right-wing, Milton Friedman worldview. The left (pretty much by definition as "the left") emphatically rejects these arguments with respect to flipping burgers, running a cash register, or delivering groceries. What's special about picking up glass bottles?