@rysiek Automated blocks, like every other method of thwarting spam, leave a window where spam gets through. The "time is limited" part might signal to an algorithm that something is up. Human eyes would see it but 24/7 eyes on every post is unlikely & probably unwanted.
An algo that flagged it, and a section for Potential Spam would leave it up to the user, and provide a way for attention to be drawn to it. Might get more reports and thus get into automated blocks for all servers sooner.