why tamilrockers website banned 

As you know tamilrockers is a torrent site where you can download hollywood, bollywood, and tamil films in HD quality. Tamilrocker website was banned in India but working in another country or region. tamilrocker website provide a pirated movies or Illegal content to their users and that time govt take action against tamilrockers website and shut the down the website but at recent time his piracy site are working. This website is a serious threat to the tamil film industry that's one of the reason behind shut down of website. 

Also read: https://famousbollywood.puzl.com/_news/How-to-Unblock-Tamil-Rockers%253F/320696