vk6flab OP , 7 days ago

Amateur Radio is regulated, as is radio in general, because it all uses the same limited resource, shared radio spectrum.

The reason that mobile phones, Bluetooth, WiFi, emergency services, aviation and “the edge” work at all is because it’s so heavily regulated.

Radio licensing isn’t a fencing of commons, it’s essential to make it work at all.

Consider for example a phenomenon called harmonics. A transmitter on one frequency also emits signal at multiples of that frequency. This is true for all transmitters. So what you do on one frequency affects other users on other frequencies.