Wasn't this considered an option to counteract the spam when there was all that annoying replyspam? I don't think anyone actually found a proper solution to that problem, I think basically the guy just got bored? I vaguely remember all the accounts used an image URL or something that was easily filtered out. But I'm sure a more dedicated spammer wouldve found a work around for that. Surely pow solves this problem? 🤔