this post was submitted on 26 Jun 2023
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It would set a higher bar for a bot, but SMS wouldn't stop them.
There are SMS providers that will happily spin you up a number with one API call, then return any messages sent to them. The spam account could have a number, confirm the message, then delete the account faster than a human could solve a captcha.
Is this really true?
Twilio is the biggest sms back end and it's like $10 per number month or something.
$1.15/number/month, though that is still some cost.
You're right, the cost would make it a huge filter for spam. But you could conceivably have 1000 accounts on a verified server for just over a grand.