Why do RF transmitters have to prevent people without a valid license from using them?
[To be precise, what the transmitters prevent is people from using them for certain kinds of transmissions; there's no user license involved]
It all comes down to practicality. It is far cheaper to regulate manufacturers of transmitters than users of them for the same effect. The money we save can buy stuff more valuable on the whole than the freedom for a few geeks to have more flexible transmitters.
I believe certain kinds of firearms in certain places are in fact illegal to manufacture for the same reason: it's easier than enforcing the law against shooting people.
Technology provides lots of solutions to social problems, of course. I don't see how there's anything wrong with that.
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