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[程序员] 为何国内只流行图形验证码，而不是 reCAPTCHA 这种人机验证？

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我看到国内大多数网站都是图形验证，例如滑块拼图，旋转图片，包括那些大厂也都是这种验证。 而国外很多网站都已经转向类似谷歌 reCAPTCHA ，cf 的 Turnstile 这人机验证。 哪种验证方法更防刷呢？ 为何国内那些大厂不自研类似人机验证，是技术难度问题吗？

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