reCAPTCHA can already be configured to be invisible and only display if it suspects the user could be a bot. For the majority of users, they won't see a captch

reCAPTCHA can already be configured to be invisible and only display if it suspects the user could be a bot. For the majority of users, they won't see a captcha challenge and it is a seamless experience with no added friction. Those who have lots of tracking/privacy protections however will more likely be flagged as a potential bot and usually have tougher challenges as a result.