The website has some form of responsible disclosure mechanism for the reporting of security vulnerabilities.
https://kb.builtwith.com/special-reports/security-vulnerability-bounty/
Frameworks
Get access to data on 30,405 websites that are Bug Bounty Customers. We know of 20,560 live websites using Bug Bounty and an additional 9,845 sites that used Bug Bounty historically and 11,461 websites in the United States.
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Get a list of 30,405 websites using Bug Bounty which includes location information, hosting data, contact details, 20,560 currently live websites and an additional 386,767 domains that redirect to sites in this list. 9,845 sites that used this technology previouslyand 11,461 websites in the United States currently using Bug Bounty.
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