ETA: So because of the psychic toll that it may or may not take on volunteer moderators, moderating for free for a for-profit company is illegal?
I guess I can understand this: It's half protecting people from getting into an unhealthy psychological trap where they're on a hamster wheel for a for-profit company but their reward is continued volunteer status rather than income. And it's half forcing for-profit companies to redistribute wealth by mandating that essentially no labor shall be free.
Unfortunately that hurts people who, with their eyes open from the beginning, want to volunteer and who don't care that the organization is making money from it. It also hurts companies by shrinking their labor pools for tasks that could potentially be shifted to volunteers.