The whole point of this particular injunction is that Sony acknowledges that there's no connection between Quad9 and any infringing party. That's not the case with ISPs, for instance, who have a relationship with either the person posting the file, or the person downloading it. Why this case is so interesting is that it's the copyright industry taking another step further, and asserting that they can hold _anyone_ liable.

So there's no argument here about Quad9 that doesn't hold equally true for the electrical utility (who could stop an infringement by turning off power) or an operating system vendor (who could stop infringement by blocking connections and inspecting files) or a neighbor (who could stop infringement by disconnecting your Internet).