eCAPTCHA v3 returns a score for each request without user friction.
https://developers.google.com/recaptcha/docs/v3
Widgets · CAPTCHA
Get access to data on 1,400,359 websites that are reCAPTCHA v3 Customers. We know of 1,080,314 live websites using reCAPTCHA v3 and an additional 320,045 sites that used reCAPTCHA v3 historically and 495,172 websites in the United States.
Get a list of 1,400,359 websites using reCAPTCHA v3 which includes location information, hosting data, contact details, 1,080,314 currently live websites and an additional 932,632 domains that redirect to sites in this list. 320,045 sites that used this technology previously and 495,172 websites in the United States currently using reCAPTCHA v3.