What is the point of having such silly prohibition? It's silly because anyone can crawl it if they want, Facebook may block such DDoS attack, but why would they bother to put up such sign when they know it's useless?
Re:Google's robots.txt
by MichaelApproved on Sunday February 23, 2014 @07:16AM
(#7285702)
They have such a large network, anything they could do to prevent unwanted crawling is probably helpful.
They're telling the public that it does not have permission to crawl the site which try have the right to do. What is the problem with that?