My first thought was that the numbers would end up being collected and screened for by bad actors and if the numbers were generated on demand, we'd eventually j

My first thought was that the numbers would end up being collected and screened for by bad actors and if the numbers were generated on demand, we'd eventually just run out of valid SSNs or credit card numbers. It might work on a small scale though. They could give a few of those numbers out to security researchers and internet abuse desks.