That's not true in some ways, TV requires a huge number of transmitters and is limited to a few channels, where the internet has a virtually infinite number of channels.

Even now it's digital here in the UK I believe each of the 5(?) muxes can only support tens of channel each.

Airwaves TV might scale easily but can only send a proportionally small amount of information, but the internet send a vastly larger amount of data per second, but struggles when everyone wants the same data at once.