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 8,557 websites Amazon AWS WAF Challenge Customers. We know of 6,245 live websites using Amazon AWS WAF Challenge and an additional 2,312 sites that used Amazon AWS WAF Challenge historically and 1,952 websites in the United States.
Get a list of 8,557 websites using Amazon AWS WAF Challenge which includes location information, hosting data, contact details, 6,245 currently live websites and an additional 26,571 domains that redirect to sites in this list. 2,312 sites that used this technology previouslyand 1,952 websites in the United States currently using Amazon AWS WAF Challenge.
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Region
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.