It's international scammers that are the problem, not internal corporations. An internal registry hurts more than it helps because it provides a list of callabl

It's international scammers that are the problem, not internal corporations. An internal registry hurts more than it helps because it provides a list of callable numbers, and chasing down scammers is way, way, way too expensive to enforce by any practical measure. Australia doesn't have this problem for the same reason OSX didn't have viruses in the early naughts. Not a big enough target.