Cloudflare’s data sources will help reduce the number of bad bots and crawlers hitting your site automatically block bots and crawlers (not all). If you would like to place a block of your own for a bad bot or crawler, you can block them by IP in your Firewall app. 

In addition, customers that are on a paid plan can look at turning on Cloudflare’s Web Application Firewall (WAF) to further help reduce the threat of bad bots and crawlers that don’t follow good behavior guidelines.