What do you call PornHub being blocked in 25 states?

A good start.

The explicit tube site Pornhub is now blocked in 25 U.S. states.

This is due to age-verification laws. These laws vary state by state, but typically require visitors of a site with over a third of explicit content to submit a government ID or other form of age authentication. Louisiana was the first state to enact such a bill a couple of years ago, and now others have followed suit. In June, the Supreme Court deemed Texas’s age-verification law constitutional, setting a precedent for such bills that come before and after.

— Source: Mashable