Broadcast is 1 way, 1 message, no need for dedicated channel,
Dude on top of a tower can shout and hundreds can hear him…
Internet is 2 way, and therefor needs a dedicated channel…
Dude at top of tower now has a single wire to each of 100 people…
Now he can only talk 1/200th of the time to deliver the unique message to each person, and its 1/200th because he has to listen for half the time, so its 1/(people*2),
and as you can see adding more people will make it slower.
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