It's the elimination of net neutrality, of the rule that said no blocking. In other words, the old rule said that when a customer asked for something, you had to deliver it; there was no blocking of websites, IP addresses, or anything like that.
I worked in the industry. It's not hard to block sites. Some sites are blocked already. They tend to be by court order, of child pornography sites usually and things like that, so there is some blocking already. It creates an open season.
The American ISPs come to us and to the U.S. government and say, “Trust us, we're not censors, we're not interested in that”. However, my grave concern is what happens when they are encouraged by, let's say, the Trump White House to start blocking or slowing down all the anti-Trump sites or CNN or MSNBC or something like that. They might then think, why do we not just make sure they're a little more annoying to use than other sources of information? The capacity is very powerful for some real manipulation of the system.
The United States has a serious speech problem already, which is to say there are increasing numbers of new challenges to free speech. We're not very well meaning. For example, I'm talking about the harassment of journalists by online trolls, propaganda, fake news.... We have all these problems. The end of net neutrality in some ways makes them worse.