A few days ago I encountered this when Cloudflare decided my IP address (which is behind an ISP-level NAT) was suspicious all of a sudden (which it hadn’t been doing, a pleasant change from when I was at this location three years ago when half the internet sprouted Cloudflare CAPTCHAs at me). It was awful to solve, worse than the substantial majority of reCAPTCHA checks I’ve encountered. Certainly nothing like the illustrations in the article.