Charging a premium for video providers would hurt youtube(google), but they have deep pockets and would figure it out. But if you and I decided we were sick of YouTube, and wanted to start Freerepublicvideos.com, and found out Comcast wouldn’t let their customers view our content, or only allowed enough bandwidth that we could stream low res videos unless we pay them, it might put us out of business before we started.
Unsure just how it works, but Roku has many free specialty channels that could only appeal to very small demographics. They send out a newsletter every month with all the new channels available. Some are pay, some are PPV and many are free.