This is true, but their terms of service do say explicitly that they are not responsible for charges. Are they going to get it right in every region, in every n

This is true, but their terms of service do say explicitly that they are not responsible for charges. Are they going to get it right in every region, in every number range? Is it even possible to distinguish between premium rate and regular rate in all parts of the world? It's really quite high risk for users.