Where was the argument that "I Can Haz Cheezeburger" is harmful? The argument is that they don't benefit from new copyright legislation, and any new legislation is likely to be a burden to them because they'd likely have to police their users more intensively. The list of signatures is from companies like these.

On the other hand, industries that rely on shipping an easily duplicable product with high up-front costs for development are likely to benefit from strong copyright enforcement. They are not on this list, in spite of being arguably more innovative.

Neither result is surprising, but saying "Entrepreneurs" and "innovators" are generally in support of less copyright legislation is disingenuous.