Challenge action against web requests that match your rule's inspection criteria.
https://docs.aws.amazon.com/waf/latest/developerguide/waf-captcha-and-challenge.html
Widgets · CAPTCHA
Get access to data on 21,697 websites that are Amazon AWS WAF Challenge Customers. We know of 10,066 live websites using Amazon AWS WAF Challenge and an additional 11,631 sites that used Amazon AWS WAF Challenge historically and 6,208 websites in the United States.
Get a list of 21,697 websites using Amazon AWS WAF Challenge which includes location information, hosting data, contact details, 10,066 currently live websites and an additional 41,900 domains that redirect to sites in this list. 11,631 sites that used this technology previouslyand 6,208 websites in the United States currently using Amazon AWS WAF Challenge.
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These are sites that we think might use Amazon AWS WAF Challenge in the future because of their similarity to other sites that already do.