Since 2003, captchas have been a common defense against bots, but also a source of annoyance for users. Techniques to bypass captchas have improved, making them more complex. A study with over 3,600 users found that users get better with more attempts at solving checkbox challenges. Website context affects solving time, with certain majors performing better. Image challenges are seen as annoying, while checkbox challenges are considered easy. The study suggests that reCAPTCHAv2 is costly and lacks security, leading to the recommendation that this technology should be phased out.
https://arxiv.org/abs/2311.10911