ISP's have had a history of strong arming companies into paying them fees for "rights" to send their data over the networks.
10 years ago the big issue was ISP's strong arming VoIP providers because VoIP was killing ISP's ability to make money off of old telephone services.
In 2014 both Comcast and Verizon was throttling Netflix so bad Netflix had to finally cave in and pay fees to both Comcast and Verizon. Verizon even mocked Netflix in the media saying shit like "we can charge them as much as we want for as long as we want and the FCC can't do anything about it". Well, Net Neutrality did something about it and it stopped ISP's from being able to strong arm companies.
The fear is now with ISP's being able to strong arm companies again, that the companies will pass the extra fees onto the consumer. Things like Netflix, Spotify, Pandora, Xbox Live, Playstation Network, current free gaming servers, might end up costing more or going from free to pay to play.
There was also talk a few years ago before Net Neutrality that ISP's wanted to introduce different "highways" that your data travels through and you would have to pay different fees to get things you like onto the fast lane of the "highway". If you like Social Media, then you get Facebook, Twitter, Instagram unlocked with a Social Media package with faster speeds on the "highway" for an extra fee. If you like sports then you get ESPN, Fox Sports, etc. with a Sports Package allowing faster speeds through the "highway" for a fee. If you don't buy the special packages, those items are throttled on your devices and run on the slow lane of the "highway".
People are worried that idea they had years ago is gonna come back.
Right now it's all speculation. For all we know the ISP's won't become evil super villains and the internet will stay the same. Or they can milk us for everything they possibly can because they know humanity is now brain dead zombies who can't look away from their phones or Netflix and we may be mad for awhile, but when the mad period wears off, then the overcharging is just now reality.
Who knows what's gonna happen though. All of us sheep are gonna pay them regardless.