Oh, I wasn't saying you can completely stop them from reading a page or individual pages. But there is activity, than can be detected as irregular. Here is a true example I know about someone who wanted to scrape their competitor's client listings. The competitor had a map with points of their customers with random user IDs and no where was the entire dataset visible. The person just built a scraper/bot, to hit every single possible ID of over 10,000 numbers. They hit a ton of empty pages, and that company should have recognized an IP incrementally crawling their data, especially empty pages...This activity should have been recognized and resulted in an IP ban.