In one way or another the whole sex trade is exploitative. It's just that some parts are more exploitative than others......
As regards agencies, I've never heard a girl say a good word about them after leaving an agency........but some girls are obviously OK with it because it absolves them of organisational problems - even where they're overworked/underpaid. Some are complicit in their own exploitation because it's easier for them not to have to think. That's how bastards like Garfoot in Blackpool got away with if for so long....
He provided the accommodation and nose powders, they just laid on their backs and collected the money for him.
But just because rogues like that exist, it doesn't mean all agencies are like that. As Davie says above, the Northeast has a radically different way of looking at things