Nielsen this week launched a syndicated SVoD measurement service, and revealed that it has already signed up eight major TV networks and studios for the service, including A&E Networks, Disney-ABC, Lionsgate, NBCUniversal, Warner Brothers. In essence any SVoD service knows full well how many customers it has and how much use they make of the service and don’t need help measuring it – but right now, in their start-up phase, most of them are not keen to reveal those numbers and even Netflix does not give out viewing details to the media. But while these young businesses may have a vested interest not to say how little of the SVoD market they have won over, and Netflix is keen not…