You'd need to hire a *lot* of operators to make that work, but whatever. Your friends pay you, you pay the operators, and everyone's happy.
Except.
Now they're not your friends, because you're charging them money for a service. They're your *customers*, and you need to cut costs.
So fine. You fire all the operators and build a machine that does all the moving of plugs between jacks. Much cheaper.
Except.
How do you tell the machine what to do?