No one seriously wants to compare the relative merits of child factory slavery and traditional child bride type situations. Like literally no one here is saying "its better to enslave children in factories compared to having them exchange their womb for protection from a local man."
Being forced to do anything is bad. Having an evaluation of your options is good. I don't think a facial argument can be made you're better off in the factory, although it might be true. I can think of many scenarios where I'd rather be in the factory, but also many where perhaps I'd prefer to have some selection of pastoral herding families to marry into over being funneled into "the one factory" where the god-billionaire has even more power than a vindictive husband.
I'm certainly not going to look at a piece of paper that says "factory move into town and women (or chidlren) took the jobs" and then just declare the women are better off. What happened before that factory was there? Did they buy off the agricultural or herding land and turn it into a waste dump? Are the power dynamics against women even worse now, where before it was a decentralized network of husbands but now one centralized hierarchal company with bosses that are even more above the law than the husband was? I don't know.