alt Hacker NewsAs we all know spam text messages aren't a thing since it's very costly and hard to spoof cell phone numbers.
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tredre3 • yesterday at 8:56 PM
Those kind of SMS check usually ban voip providers. So you need a real line or a prepaid cellphone, and it can presumably only be used once or twice on this service before the number is "burned".
Such checks, although not perfect, do prevent a huge amount of spam and bots by having a very real cost for bots/spammers, and essentially no cost (other than their privacy) for the user.
Even a one cent toll is enough to change the economics of many bot behaviours.