It still exists primarily for binary file sharing. Overall, I think Usenet works much better than non-private torrent trackers.
A big reason why Usenet is still alive and kicking is thanks to piracy. The same applies to IRC (XDCC), but probably to a lesser extent.
Mutually reinforcing cycles that led to the current state of Usenet as a seedy backwater where it was once an essential part of the Internet (and the UUCP network before it).