Aside: Not exactly this, but Amazon, Google(signup page) and few other big infra providers still use squiggly textual captcha. ReCaptcha is used by small player

Aside: Not exactly this, but Amazon, Google(signup page) and few other big infra providers still use squiggly textual captcha. ReCaptcha is used by small players(no offense intended) as ux is often not main priority. You can try to spam amazon/google et al. signup pages and you'll be greeted by those sqiggly of olden days. :)