And when Cloudflare is the proxy for a web site, it’s Cloudflare that provides the HTTPS connection, meaning that you don’t actually have an encrypted channel directly to the site. Cloudflare is the man-in-the-middle eavesdropping on all of your communications with that site. Your bank transactions, your medical records, your personal messages, etc.
“Man in the middle”. They are used by a lot of web services as a proxy, usually to prevent DDOS attacks.
And when Cloudflare is the proxy for a web site, it’s Cloudflare that provides the HTTPS connection, meaning that you don’t actually have an encrypted channel directly to the site. Cloudflare is the man-in-the-middle eavesdropping on all of your communications with that site. Your bank transactions, your medical records, your personal messages, etc.