Google s reCAPTCHA is a type of CAPTCHA that uses prompts to decipher humans from potentially malicious machines or bots. Cloudflare is replacing it with a free, drop-in replacement service, hCaptcha. The network services company said the main driver for the swap was that Google is now charging for use of its reCAPtCHA tool but customer privacy and availability were other factors. Google said there is no charge for this service for under a 1M queries/month limit.
Source: https://threatpost.com/cloudflare-axes-google-recaptcha-due-to-privacy-price/154635/