As much as I enjoy blind cynicism, I can't find a point here. Spam really doesn't cost anything significant to send. If all the CPAN user's email addresses were made public it doesn't matter if a list of "used" modules is as well - it would be more economical to just spam everyone.
However, to further the worthy cause of undiscriminating negativity, you may wish to consider the following replies:
- Hello! Security! Now everyone will know what modules I use, then they'll look at their source code, then they'll find bugs, then they'll learn how to exploit those bugs, then they'll find my system, then they'll use it to illegally download N'Sync mp3s! Then the RIAA will have me thrown in jail for life! AAAHHHHHH.... where's my tinfoil hat when I need it?
- People will look at which modules I'm using, then if they have problems and the author isn't available, and they don't ask in a public forum, they might randomly select a user of that module, and that might be me! Then I wouldn't be able to get any work done and would have to spend all my time flaming people because I can't just ignore an email! AHHHHH!
- People will realize I don't do any serious coding and just play around with Acme:: modules all day... Then they'll find where I work and tell my boss! Then I'll get in trouble and he'll make me program in COBOL...
Sorry, I went too far on that last one. Nobody should joke about COBOL... I'll show myself out.
8^D