Have you ever tried to visit a web site and found a Cloudflare error page instead? It might have looked like this:

webproeducation.org/…/error-524-cloudflare-233e5a…

Do you know how they’re able to insert that error page into the response that reaches your browser, even though it’s an https connection and your browser assures you that it’s “secure”?

Clouldflare is able to do this because they are a middle-man between you and the site. They can eavesdrop and/or alter anything sent or received on that connection.