Cloudflare 從 Google 的 reCAPTCHA 改用自家的 hCaptcha：「Moving from reCAPTCHA to hCaptcha」。
看起來其實就是錢的問題，reCAPTCHA 要收費了，而以 Cloudflare 的量會太貴：
Earlier this year, Google informed us that they were going to begin charging for reCAPTCHA. That is entirely within their right. Cloudflare, given our volume, no doubt imposed significant costs on the reCAPTCHA service, even for Google.
另外 hCaptcha 有提供免費版本給一般網站用，剛出來這幾天等白老鼠寫心得後，再決定要不要跳進去測試...