Thanks for your question. Curiosity is first step towards knowledge. I wish I was eloquent enough to put decades of history in few words. Best I can do is point you towards this book https://www.goodreads.com/book/show/57313237-sanghi-who-neve.... Note, anything even remotely exposing the issue will be immediately tagged as nationalist, BJP, RSS, Modi etc. The book only is about personal experience of one media person, and doesnt dig deeper into what brought media into this state. It can be starting point and you can follow the references further.