There’s a great book all about his rise to fame/power, called Down and Dirty Pictures: Miramax, Sundance, and the Rise of Independent Film, by Peter Biskind. Not exactly a short read but putting aside the fact that Weinstein is human sewage, it gives a very interesting and detailed account of exactly how he got to where he is.
Basically, he was very, very good at spotting cheaply made films that he could buy, edit, and turn into Oscar fodder, and that made him rich enough to start making the films himself. He is singularly repsonsible for the careers of Billy Bob Thornton, Quentin Tarantino, Gwynth Paltrow, Damon and Affleck and a host of others. Hence the complete silence.