They’ve hinted there’s a reason for it… The problem is BB’s not talking… literally and figuratively, but he seems to have a plan, at least.
Also, people in the mines HAVE powers. Some of them at least. Also, they have a home, a family and can have children (also part of the problem, since they have an over-population problem), all of which they wouldn’t have if they were actual slaves, and arguably, they wouldn’t be in that situation.
My guess is that, like what would happen in a caste system, depending on which powers you get in your terrigenesis, you get sent to work somewhere accordingly. I’m sure there’s people working in food production, people working as army members, etc…
Yes I can, because it’s a ficitonal society of super-powered beings living on the moon… Caste systems are fairly common in sci-fi and fantasy stories.
Edit: As I said, this could’ve actually been a very interesting series… but they’re really suffering from a lot of budgetary and obvious rushed production issues.