They already have immunity for users' infringements via the Safe Harbor provisions of DMCA. The safe harbor provisions requirements are a lot less stringent th

They already have immunity for users' infringements via the Safe Harbor provisions of DMCA. The safe harbor provisions requirements are a lot less stringent then Common Carrier. They must register as an ISP, can't modify data, and can't directly profit from infringement or promote it. Certain ISPs already have done things that should get them deregistered though, such as compressing images, replacing ads or injecting content. For example, comcast injects their copyright warnings into html pages transfered.