If you want to scrape data from someone else’s website, there are many different tools at your disposal. These resources to collect and use another site’s confidential information vary in complexity and size; mostly though some scrape data better than others.
Take blacklists. Blacklists are able to block IP addresses that are known to scrape data. The problem with them is that IP addresses are not permanent and often change, in which case the blacklisting is ineffective. When you use blacklisting to scrape data you risk blocking users who are legitimate.