alt Hacker News> I get unsolvable recaptchas all the time, especially on cloudflare pages.
If you really mean reCAPTCHA (the one with a “select all squares that have X” kinda challenges), then Cloudflare hasn’t used that for quite a while now. archive.today uses a Cloudflare-looking (old style) page with a reCAPTCHA (and they do serve it quite often), but I don’t think I’ve seen other sites do that.
No you can get literally unsolveable captchas with cloudflare. You tick the box and it just refreshes and displays the unticked box again. Or people it on gateway endpoints that just return plain text errors (Humble does this).