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Twilio and their users are the victim here... Twilio having KYC would not solve the problem, they do not the own the numbers the expensive texts are being sent to. Twilio should just enable their anti fraud systems by default (by the way this is no panacea, like every other anti fraud this is a cat and mouse game, there is often no clear way of telling that a number is premium rate, and many carriers are in on it too and use normal mobile number ranges).