I never claimed nofollow was some sort of panacea. nofollow makes spam less profitable, period.
Hashcash users cannot reject an unstamped (or invalidly stamped) message outright. When everybody uses it and software becomes better trusted and debugged, they will; but until then the only reasonable way to use it is with a scoring filter, and never set the scores high enough that the binary decision about a message is made solely by its hashcash status. "Make no mistake, we're talking about a pretty large time scale here."
I also never claimed comment spam was useful solely because it influences rankings. (I don't know why you insist to think that I did.) Spammers will spam where they expect return on their investment. Period. What I do claim is that comment spam's ability to influence rankings — and especially to "hijack" the top hits in large search engines — is an entirely new class of opportunity for spammers, which gave them hella lot of incentive to start doing it. Of course there's inertia, and of course they won't stop just because you take some of the profit away. If suddenly litigation rises a hundredfold, spam won't stop either. But all other things being equal, I believe that it will slow down.
In reply to Re^7: (OT) nofollow considered harmful
by gaal
in thread CPAN::Forum opens its virtual doors
by szabgab
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