Anyone who thinks this one person could have done anything about it back then is thoroughly deluding themself. Weinstein was at the height of his power for most of those years. Just like with Bill Cosby during his decades-long reign as a giant star, everyone was willing to look the other way or turn a deaf ear towards any rumblings or whispered accusations.
Christ! Look at the history of posts by the circle jerk of NWP veterans here who can do no wrong when challenged by new blood, and who resort to threats of leaving PFA and demanding "uppity" new users be banned for disturbing their sandbox. And there isn't any money involved in such matters. Just a converstion space on the interent. Throw in millions of dollars at stake and those same circle jerkers would probably jump at covering up worse offenses to protect fellow members of that club!