Honest question: is your opinion that the 29% is composed of automated bots who were blocked by the CAPTCHA before, or is it composed of people who just don't like CAPTCHAs?
...or people who can't do CAPTCHAs. I regularly have to retry CAPTCHAs 3 or 4 times because they are utterly illegible. Sometimes I just give up and move on. Maybe I'll build a bot to help me solve CAPTCHAs!
Same. It's ridiculous that someone with 20-20 vision and good enough vocabulary to ace the verbal SAT fails roughly the first 3 or 4 tries at many CAPTCHAs these days. Some are just damn near impossible to decipher, and some I could have sworn I got right and checked multiple times b/f hitting submit, but failed anyway.
I'm so sick of them now that I only do the ones on really consequential websites, like ones handling my money. Any that I can just skip, I do.
Once or twice I've gotten a truly bizarre word I suspected doesn't even exist, and looked it up on dictionary.com to find it's not even in there. I don't bother expanding the search to the Oxford English dictionary for those, since I'm already annoyed with the wasted time.
It seems CAPTCHAs are one are where the tech is getting worse, not better.
They probably use a hidden javascript captcha, which falls back to a real captcha if not completed. I'd be hugely surprised if they dropped any kind of bot prevention.
Having said that, maybe they figured "well, bots are getting in with the captcha, so let's just drop it". But I doubt that.