Google's latest iteration of the reCAPTCHA system, reCAPTCHA v3, is now available to website administrators and webmasters. reCAPTCHA v3 runs in the background, tracking user behavior and assigning a risk score based on that behavior. Administrators can use this score to assign thresholds requiring further authentication if needed, allowing the bot-battling system to run unobtrusively for most users.
https://www.notebookcheck.net/Websites-could-battle-more-bots-without-interrupting-users-thanks-to-reCAPTCHA-v3.354481.0.html