Anyone involved in pornography who would've previously bought a .io, .fm, .tv, or any other 'non standard' TLD just so they could have a meaningful domain name.

Now they can get a meaningful domain name, and have a TLD that emphasizes the point of the site.

The whole discussion about these domains being blocked is a ridiculous one---anywhere that would block .xxx TLD would also block any pornographic content in general regardless of the domain name.