There is a funny aspect to this. Registry and registrars already has a tradition to sell dns blocking registrations for a fee, and when copyright rights holder

There is a funny aspect to this. Registry and registrars already has a tradition to sell dns blocking registrations for a fee, and when copyright rights holder (or even the police/government) want to block something, that fee is still required and it need to be paid each year. As an example, when it came to piratebay.se the Swedish police budget has been paying it every year since the court made the decision to take it. It not much for a single domain but it does not scale and the police really do not want more of them. It is for this reason I suspect that rights holders targets ISPs. Supporting a block list is in comparison free and ISP has yet to start to take a yearly fee each time they add a new domain to the list.