Why CloudFlare Workers doesn't have DDOS protection?

Hello all! I have an example of a site that is protected by Cloudflare DDOS, it is clear from the inscription “Just a moment, Checking if the site connection is secure”. But the worker just returns the site as a normal html file.

sry for my English

Workers have DDoS protection. What issues are you facing?

I don’t see her. If you go to the same chatopenai, we can see the text from Cloudflare.