There is a popular misconception though- which is that net neutrality will prevent Cable companies from charging more if you use more data.
Their argument was that Netflix takes a huge amount of data, compared to other sites, and that it makes sense if this is more expensive as a service it should be more expensive to the consumer.
But net neutrality doesn't dictate they can't charge more for 20 gigs of data than 10 gigs of data. If they want to make 15 gigs of data more expensive than 5 gigs, they theoretically could, and net neutrality will be ok with that.
What net neutrality dictates, is you can't count data as more or less than other data of equal size. If you use 2 gigs of data on Netflix, and 2 gigs of data on Hulu, and 2 gigs of data loading gifs on TYM pages, they all count for the same 2 gigs. What net neutrality prevents is them from charging more for 2 gigs of data from site A than 2 gigs of data from site B. Data must be treated equally- with size considered equal. NOTHING prevents them from saying "if you use our service more, you need to pay for that extra service" and NOTHING prevents them from saying "if you use are service less, you can pay slightly less". What it says is "The amount the service is used is all that matters- the specifics of what sites make up those gigs of data transferred cannot be discriminated upon by the company to charge more or less than other data of equal size"
They like framing the argument this way, because it almost sounds sensible. You use more data transfer, you pay for more data transfer. But this obviously isn't the case. They don't care how much data you use, they care WHERE it comes from- that way they can go to the source, and start charging that company more if they want users to get to the site fast- and that company then naturally has to pass on that cost to you. Without Net Neutrality, the cable companies can (and actually already did) charge Netflix a fee in order for the ISP to stop bottlenecking the connection between them and their customers. How often can they do this to a company like Netflix before they need to start upping their subscription costs to pay the "ransom fee" of the ISP's?
So that's why it's important. And if Net Neutrality isn't passed, you won't have to wait very long to feel these effects- they've already been doing it to just test the waters, and this is why there was a period not long ago when Netflix ran ultra slow. They were being bottlenecked and had to pay to get out of it.
