A new NPD report published Monday shows that premium cable networks like HBO and Showtime are quickly losing viewers while Netflix continues to rack up subscribers at an impressive clip. But according to those premium cable networks, NPDs data is flat out wrong. It took less than 24 hours for HBO and Showtime to come out swinging against the idea that Netflix is stealing their customers. While it is true that video services like Netflix have gained, so too have premium cable channels, Showtime said in a statement.