The key difference is that radio is a broadcast medium, while the internet is a communication medium.
For radio, the process of sending out data to the world is independant of who is listening. Its basically shouting into a room, and anyone who cares to hear can just choose to listen.
For the internet, everything is done via 2-way communication. If you want the video, you don’t just listen in to some shouted broadcast. You have to *ask* someone to give you the next bit, and that server has to understand and respind to each request individually.
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