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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.
No need to store the phone number hash at all. Discard it after the code is sent. What is the purpose of keeping the phone number hash?
Some kind of biometric scan.
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
Voucher-Kamph could work, but the bot might kill you if it fails the test