1. A way for politicians and the state to track porn habits to US citizens and use that information against them in the future. Blackmail for the future politicians, business leaders, and wealthy to coerce them into doing what those in power want.
2. A way for conservatives to tighten the noose around non-chaste materials and begin to purge them from the internet. And if that works, that's hardly the last thing that will go. Next will be LGBT content, women's rights content, atheist content, pro-labor content, and more. (Or if you're on the other side of the political spectrum, consider that the powers could be used to remove Christian content, 2nd Amendment content, etc. It doesn't really matter what is being removed, just that the mechanisms are in place and that powers can put a lid on the populace.)
We aren't screaming loudly enough.
Do not try to sugar coat this with a pedantic mistake.
This is far worse.
It's a first step down a path the Big Brother state wants.
Yell.
Scream.
Protest.