[morelandjs]

I’m not fully subscribed to the idea that all public scraping of websites is bad, or that this project is a productive contribution. It would be nice to have search engines other than Google, and that necessitates bots being able to index your website (in some respectful manner).

[troyvit]

It looks like the tool lets anybody that robots.txt allows through. IOW it doesn't stop all public scraping, just the scraping you want to stop.