Instead of outright blocking all traffic from known bad IP addresses, they have a mechanism to let actual users go in. That mechanism relies on a captcha flow, and on setting a cookie in the user's browser to bypass the IP block.
Disclaimer: I am inferring all of this from your screenshot. CloudFare's actual process and intent may vary.
You are seeing that page because CloudFare believes your IP address is behaving badly, for whatever reasons. ( see https://www.google.com/webhp#q=202.72.107.83 )
Instead of outright blocking all traffic from known bad IP addresses, they have a mechanism to let actual users go in. That mechanism relies on a captcha flow, and on setting a cookie in the user's browser to bypass the IP block.
Disclaimer: I am inferring all of this from your screenshot. CloudFare's actual process and intent may vary.