yes it is? you realize the whole anti-net neutrality argument is based around the fact that you pay for categories of internet usage, right? There's no google vs yahoo throttling, it's Google vs Netflix because one is part of a browser package and the other is part of the video package
there's no additional cost for the ISP between 10kB of data from Google and 10kB of data from Netflix, why the forget would you pay more for one than the other
also, without net neutrality, ISPs
could discriminate "within" categories
For instance, Yahoo is owned by Verizon. If you have internet through Verizon, Verizon could give you data from Yahoo at a fast speed, while restricting Google unless you pay $5/mo. Since most consumers won't want to do this, they'll start using Yahoo, which creates an unfair market.
Now imagine they do this with news sources, and you give ISPs the ability to determine what information the public can see easily, and which they can't.