This seems like a laudable project, but when compared with hCaptcha or ReCaptcha, it feels very clunky. I worry that it will be possible to automate solving it

This seems like a laudable project, but when compared with hCaptcha or ReCaptcha, it feels very clunky. I worry that it will be possible to automate solving it, particularly for the slider ones, which I think could be automated in a straightforward way. I think with further refinement, it would be possible to build a captcha that respected privacy that was as secure as the leading alternatives. I am just not certain that a captcha is necessarily going to be a workable solution at all as time goes on (especially in light of advances in computer vision and AI more generally). I think that the crux of the problem is that bots are going to get better and better at solving these kinds of challenges, and humans are pretty much going to stay where they are. I suspect the bots have already caught up.