Well, the principles that explain why it wouldn't be a good idea are very similar with respect to digital devices: you're putting an arbitrary fee on top of a general purpose technology or a general purpose service that Canadians use for all sorts of purposes. It effectively punishes those who don't use the Internet for one purpose in an attempt to make up for the wrong caused by a very small number of people who do abuse it.
Remember that a lot of people use the Internet to acquire legitimately licensed entertainment products. We provide a general purpose platform that we keep making better and better so that people can use those services. If it has the unfortunate effect of providing better and better access to illegitimate services, well, that's not an intended consequence. But that's why it's so important to go after those illegitimate services and shut them down.