It's also worth mentioning that Comcast is one of the largest "traditional" media corporations on Earth, and is therefore heavily motivated to act against media

It's also worth mentioning that Comcast is one of the largest "traditional" media corporations on Earth, and is therefore heavily motivated to act against media sharing (piracy). Everything about their business outside internet service is built to be a vertical integration, so it's only natural to use their ISP business arm to support that.