What is "predatory"? What is "just"? Justice for some equals unemployment for others. Is that just?

If safety and breaks are mandated, and someone is still willing to work for less, you're stopping them from bargaining to have a job for less pay, do you acknowledge that?

If "predatory" is agreeing to what someone wants to offer to take a job, why don't you tell the worker not to offer/participate?

Your stopping the "predatory" behavior has done nothing to alleviate the person's financial situation that causes them to consider agreeing to it.