A lot of early spammers would harvest SMTP addresses from NNTP posts. ;-/
Subsequently, a lot of NNTP clients, stopped sharing SMTP addresses as a mitigation.
Idiotically, years later some blogging software dev with more readers than sense (Joel on Software probably? I no longer remember; think the sorts of dumb it.sh who advocate for "fizzbuzz" in interviews [which is the sort of programming problem elementary school students with a grasp of BASIC would have surpassed in childhood]) decided to advocate for using "email addresses as a login" and that anti-pattern became extremely prevalent in subsequent years, even though it was after there were multi, ongoing, even commercial efforts in anti-spam. It's almost as if: popular bloggers maybe don't have a clue? Or maybe: they were in cahoots with spammers? (Then again, I also remember when dip it.sh Daring Fireball blogger asserted that Johnny Cache's bug found in Apple's WiFi stack was hogwash, which incited MoAB [Month of Apple Bugs] by security researchers, in retaliation to what stupidity it was to fanboi so hard for Apple unnecessarily. I guess the Daring Fireball individual missed the reality that Johnny Cache graduated with a Masters from the CISR [Computer Information Security Research] program at nps.edu [previously: nps.navy.mil] aka the Naval Postgraduate School, where reverse engineer wizards such as Chris Eagle were among the instructors, and really had nothing to prove, nor lie about.)
Admittedly, I mostly stopped using NNTP/Usenet back in the days when Netcom moved it off of local "spool" and the latency (over dial up) seemed excessive.
Last I checked, commercial NNTP providers with extremely long retention policies seemed to be favored by some warez sorts utilizing NZBs (the professed "defense" relative to p2p is that: by only leeching from a commercial NNTP provider, there was less liability as an individual was not sharing warez with others in a p2p torrent/swarm/etc.? I dunno, I am not a lawyer and the idea of paying for an NNTP provider just to get access to a lot of alt.binaries.* hierarchy seemed like it wasn't my cup of tea.)
CC:
@gmc