The Indian government has blocked over 1,000 piracy websites, including Tamilyogi. However, because these sites change domains rapidly, a simple Google search for may still show results from mirror sites. The Department of Telecommunications works with ISPs to continuously update block lists, but it is a game of whack-a-mole.
The Tamil film industry has been proactive in combating piracy: Muthukku Muthaga Tamilyogi