Part of Oprah’s demise started when the problems with her school in south Africa had major problems with sex abuse of some students [twice, IIRC].
That showed she had little or lost control and that the school seemed to be just an insincere PR effort.
Shows how much time I spend thinking about Oprah!
I did make it a point, when I started seeing books in the stores with "Oprah's Book Club" stickers on them, to never buy one.