Why get licensed?
The blunt answer: transmitting on amateur frequencies without a licence is illegal. The better answer: the licence is the door to everything worth doing on the radio.
1. It makes you legal
Amateur bands are reserved for licensed operators. Buying a radio does not give you permission to talk on it. Passing the exam does - and it is the reason you may run up to 1,500 watts, build your own transmitter, and modify your own equipment, all of which is off-limits to unlicensed users.
2. Communication that does not depend on anyone else
Your phone needs a tower, a network, and a bill paid. Ham radio needs a radio, a battery and an antenna. In hurricanes, wildfires, earthquakes and long power cuts, amateur operators have kept information moving after everything else stopped. Many operators volunteer for exactly this reason.
3. It is a genuinely worldwide hobby
Over three million people hold amateur licences globally. On a good evening you can speak to strangers on five continents from a spare bedroom, with no subscription and no account. People collect contacts with distant countries, chase islands and mountaintops, and enter contests to see how many they can work in a weekend.
4. You learn something real
Radio is electronics, physics, weather, geography and computing all at once. Plenty of hams got their first job in electronics, networking or broadcasting because they had a station at home first. It is one of the few hobbies where you can legally design, build and use your own transmitting equipment.
5. The people
Clubs meet in nearly every county in the country. Newcomers are handed test gear, driven to exam sessions, and talked through their first contact. If you like the idea of a hobby with a support network attached, this one has it.
What it costs
A study guide (or a free website), a modest exam fee, an FCC application fee, and a radio if you want one. The licence itself lasts ten years and renews for free. That is the whole barrier.