There are a lot of child actors who do one McDonald's commercial with no ill effects and it's a great college fund starter for them. People like Haim & Brad Renfro were picked specifically because their parents were fuckwits etc. But most child actors aren't exploited in that way. A lot of kid actors are just like extras and it's to build a college fund. There are tutors on set and they ultimately have authority over the kids. There are checks and balances and most productions have competent tutors, set medics etc around. Problems can arise when the tutor or set medic is an aspiring actor or some shit but responsible productions steer clear of that shit. Emma Watson was not one of Harvey's girls, her big break was the Harry Potter movies and he wasn't an EP on them, David Heyman was. She worked with directors like Alfonso Cuaron who made the main 3 in the cast write essays about their characters. HP movies were probably some of the most nurturing and non-exploitive child-led movies ever. (Yes Radcliffe developed a binge drinking problem but about 90% of British men have a binge drinking problem. Also: he's fine now. He works consistently and has even done fun stuff like host HIGNFY.) JK Rowling's a teacher and a mom in addition to being a zillionaire, someone who was more powerful than any studio she worked with. She started a kids charity and she's one of the few people to speak out about the trans insanity. She's not afraid of anyone. Emma's also British - she can work forever in film & theater there. Some actors who stood up to Harvey like Jason Priestly just went home and worked there. (Priestly's Canadian) Emma's not as easy to threaten as a US based or say Eastern European actress. One last note on JKR's power in terms of creative control. Disney and Universal were both in the running for HP at their parks. JKR was toying with the idea of having them build a train to take people to the Harry Potter area of the park. Disney hemmed and hawed, they weren't sure, it seemed like a lot of work. Universal said, Lady we'll build you whatever the fuck you want. So she went with Universal. JKR wasn't intimidated even by Disney, one of the biggest names in entertainment. That's how valuable she knows her intellectual property is. That's power even the Harveys of the world wish they had.