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Article: Enable reCAPTCHA to Prevent Spam Cases
URL: https://help.salesforce.com/articleView?id=customizesupport_web_to_case_enable_recaptcha.htm&type=5 (https://help.salesforce.com/articleView?id=customizesupport_web_to_case_enable_recaptcha.htm&type=5)
Article: reCAPTCHA FAQs
URL: https://help.salesforce.com/articleView?id=customizesupport_recaptcha_faq.htm&type=5 (https://help.salesforce.com/articleView?id=customizesupport_recaptcha_faq.htm&type=5)
Let me know if it helps you and close your query by marking it as solved so that it can help others in the future.
Thanks.