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 20,754 websites that are Amazon AWS WAF Challenge Customers. We know of 8,651 live websites using Amazon AWS WAF Challenge and an additional 12,103 sites that used Amazon AWS WAF Challenge historically and 5,278 websites in the United States.
Get a list of 20,754 websites using Amazon AWS WAF Challenge which includes location information, hosting data, contact details, 8,651 currently live websites and an additional 40,010 domains that redirect to sites in this list. 12,103 sites that used this technology previouslyand 5,278 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.