这网站用了免费谷歌服务,google recaptcha
asp.net core 使用 google 验证码(recaptcha v3)代替传统验证码
顺便提一下,在 recaptcha 被 google 收购后,冯·安还有很多基于
add support for google recaptcha in user registration to prevent
本是同根生相煎何太急用google语音识别api破解recaptcha验证码–a胖
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