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 20,124 websites that are Amazon AWS WAF Challenge Customers. We know of 8,656 live websites using Amazon AWS WAF Challenge and an additional 11,468 sites that used Amazon AWS WAF Challenge historically and 5,402 websites in the United States.
Get a list of 20,124 websites using Amazon AWS WAF Challenge which includes location information, hosting data, contact details, 8,656 currently live websites and an additional 38,617 domains that redirect to sites in this list. 11,468 sites that used this technology previouslyand 5,402 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.