There are many things the law permits at a small/manual scale but forbids at a larger/automated scale. This makes sense because in the latter case, the cost to

There are many things the law permits at a small/manual scale but forbids at a larger/automated scale. This makes sense because in the latter case, the cost to the person doing the act is smaller. For example, there's no law against making one phone call to a random number in the phone book. But if you use an autodialer to call everyone in the city, you're breaking the law.