Bots can set up email addresses far easier than people can. You're making far more additional work for the users than you are for the bots.
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That is true. The only problem email/phone auth solves is disincentivizing creation of alt-accounts by making it a hassle for real users. I think most communities are afraid of alt accounts. Except reddit.
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That makes sense, except that again it doesn't stop bots from setting up a gazillion accounts, the bot just has to be programmed to set up an email account and go to the link in the email.
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Honestly Captcha+Username is probably far more secure than Email+Username. And if the point is to "make it a hassle" for real users to get multiple accounts, I'd just put a limit on signups per IP+UserAgent or something.
End of conversation
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