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I'd ask for their cell number and send a verification code. That'll stop 95% of all duplicate accounts. Keep the hash of their phone number in a hash list, rather than the number itself. Don't allow signups from outside whatever region you can SMS for free.
I realize this would mean relying on an external protocol (SMS), but it might just keep the crap out. Would help for ban evasion too, at least within an instance.
Until someone uses a bunch of Google Voice numbers and gets each of them banned before someone a few months later happens to get one of the banned numbers and tries to sign up.
Only bringing it up because a similar thing happened to me; I got a Google Voice number and found out it was already related to a spam account on a site I wanted to use. Their support team understood and it had been like 6 months so they undid it but still. Bit of a pain.
Show a picture, video, audio clip or text designed to elicit an emotion. Ask how the user feels.
Wait a minute - GPT-4 - is that you asking this question?
Captcha or recaptcha is good enough imo, no point in reinventing the wheel. Alternatively, split instructions in an email and on the website. For ex: Send email with What is the square of 3 (sent as an image for every word) And on the website Email + 25 = xxxxx
LLMs, IIRC, are really bad at IQ-test type questions that require abstract reasoning, especially if they require multiple steps. So, something like
The box is yellow and red.
If the box is yellow, it is good.
If the box is blue, it is unhappy.
If the box is good and happy, the box is awesome.
If the box is red, it is happy.
Is the box awesome?
is what I'd use.
Um wtf, I'm starting to doubt if I'm a human. ๐ค
Some kind of biometric scan.
Say to it
This statement is false