Despite all the legal attacks in the UK and elsewhere, this is probably the biggest blow to piracy sites so far. When one gets taken down another spins up, but if you turn your adblocker off they all have these awful adverts.
For organic traffic pirate sites, the biggest blow was Google's algorithm change. For websites which used a freemium model, the biggest blow was PayPal, Visa and Mastercard banning file sharing websites from using them. Todays announcement was merely a nail in the coffin for those sites.