Broadcast television is sending one signal in one direction over a wide area. No special antenna hardware needed, bandwidth usage remains low.
Satellite internet needs to send and receive multiple, separate signals. All those individual signals have to compete for limited bandwidth (both in the radio spectrum and the satellite’s processing power), slowing down the service for everyone.
Starlink seems to have mitigated this problem by basically just throwing more and more satellites with special directional antennas at it. Seems to work, but expensive as hell and there’s still the problem of high ping since the signal has to travel a greater distance to space and back.
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