The court order they are referring to is non complaint. Similar action was taken earlier this month by Reliance and MTNL. But Airtel has the largest market share as an ISP and it also has blocked the most number of websites.
I think this ‘court order’ is just an excuse Airtel and others needed as the infrastructure they have is incapable of dealing with the traffic such websites attract. So instead of upgrading infrastructure they are taking the easy way out. I mean its understandable if they want to block torrent indexers but to block totally legitimate websites like Vimeo and DailyMotion shows its all about the bandwidth. Of course there will be a backlash to this. This isn’t China.