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AWS WAF CAPTCHA

Cloudflare Interstitial CAPTCHA

GeeTest

Google reCAPTCHA

Google reCAPTCHA v2 (Easy Difficulty)

Google reCAPTCHA v2 (Moderate Difficulty)

Google reCAPTCHA v2 (Hard Difficulty)

Google reCAPTCHA v3 (Invisible)

Lemin CAPTCHA

Text-based CAPTCHA

Cloudflare Turnstile