I’m a big fan, especially because it not only makes my “profile” much harder to identify, it also costs the advertisers more. Anything that harms advertising is a good thing IMO.

Usenet is almost always split rar files, and not all Usenet providers are in the same DMCA covered jurisdictions so instead of sending a takedown to one site you need to send a takedown for 100s of files and to dozens of providers. The takedown requests can often be rejected on the grounds that fjdjwofhxzzoajfnq.r01 isn’t actually the offending copyright material claimed by the notice.

Its possible to do manually but that costs more money and a lot more time, almost all of the requests these days are automated using bots with very little human oversight.