There is extremely low risk of colliding with a real number, and people didn't feel guilty about using services that had nearly zero marginal cost. Phreaking or

There is extremely low risk of colliding with a real number, and people didn't feel guilty about using services that had nearly zero marginal cost. Phreaking or fake-cc-number fraud was considered pretty victimless, and if there was a victim it was a baby bell that had just been busted up for being a massive monopoly.