Some would say Oprah is. She gained popularity initially hosting a "Jerry Springer" lite type of talk show in the 80s/90s. She's since given platforms to people like Dr Oz who's hawked pseudo-medicine, Marianne Williamson (former presidential candidate) who tries to sell alternative medicine and pseudo-spirituality.

It doesn't have to be a 1 to 1 comparison but there's plenty of people out there that would say along one or more dimensions that Oprah is no better, better, or the same as Rogan.