It is not so much with respect to regular usage.
More to do with downloads... long downloads that tie up the internet.
Nowadays you can download a movie if you want to view it.
Computers are now fast enough that you can watch TV on the computer... takes up a lot of bandwidth...
When we sell on eBay the actual time we communicate with eBay, or with our buyers is quite low
Nothing like that download or any other lengthy communication using a lot of internet time...
But then there is a lot of "behind the scenes" communication going on with each computer on the system... programs with regular updates... cookies tracking
There is more going on than what we see.