Cloudflare has announced that it will deprecate the __cfduid cookie starting on 10 May 2021. The last __cfduid cookies will expire 30 days after that. This change is due to concerns about privacy and user data, as well as a desire to simplify web services. The primary use of the __cfduid cookie was for detecting bots on the web, which can disrupt service or compromise security. Cloudflare has been experimenting with alternative methods for bot detection that do not rely on collecting end-user IP addresses and will continue to work on ensuring quality in their bot management products after removing this cookie.