Yeah....I know what you mean. Also agree about not wanting any part in trafficking and/or slavery.
But I think the majority of these cold girls with no other signs aren't, in the overwhelming majority, trafficked. If you're trafficked etc. the trauma must be such that there will be signs, some subtle but some not.
I've had my share of these bad punts and, deep down I think, most of them are because the girls are in a kind of economic vicious circle. They're not cut out for it, for whatever reason (usually psychological) and they hate it. But, the money, even though they don't get any repeats at all, is still better (or no worse) than the kind of work they would get in the real world, either in the UK or at home if they're EE. So they feel they're stuck with it.
It's a bit like what you say above about the round about way. But maybe it's economic "coercion" rather than trafficking. Of course that's always been there, for millennia.
It's a part of the feminist anti-prostitution agenda that I agree with. It may be that for some WGs the "choice" isn't a real choice at all but it's not always to do with drugs or slavery, it's much less dramatic and chronic. It's to do with the gross economic equalities in our society between rich and poor. Some, quite a lot, make a success of the Belle de Jour choice and there's absolutely nothing wrong with that but a good proportion don't.
I'm not saying there isn't trafficking but I imagine a trafficked girl will be more than just not good at the job. I'm ready to be proved wrong, though; maybe I've misjudged (and overthought) the whole thing and the above argument is not only fluffy but, much worse, complacent.
Maybe a WG perspective on this would be useful.