I've never understood what happened to reCAPTCHA, it was originally so great and is now just so, so toxic.
Originally it was an awesome solution based on OCR'ing books that usually worked quickly on the first try, and almost never took more than two.
Then it turned into a single checkbox (analyzing mouse movement) so it was even faster... and I remember some simple image-based like "select the images of cats" that were also easy to get right. So even better.
But THEN... in the past couple of years, the image-matching started asking exclusively for analysis of street images, that has two huge problems:
1) The images are so blurry and ambiguous it's really hard to get right, it feels like a test designed to make you fail
2) You never know how far you have to go -- you keep clicking items, they keep replacing them with new ones, and there's zero indication of if you're almost done or if you're getting better or worse.
Once I did one for three minutes straight, neither passing nor failing, until I just gave up and left the page... if it's a bug, that should never happen. If that's supposed to be able to happen, that's the apex of asshole design. Either way, it's a failure in every way.