Except it is nothing like that.
When you go to a website are your informed how much bandwdith will be ad only?
How about what is done with your personal information?
When you visit a website are you shown which tracking cookies will be left behind?
You cannot stop visiting the site, once you have visited the ads have been loaded, the cookies have been dropped and your info has been mined.
As an example, lets say you borrow my truck. You compensate me for the use of my truck to move some boxes in town.
But then you use my truck to tow a trailer across the country. That is more wear and tear on the vehicle.
And then you take my personal information that is on my vehicle registration with my home address and sell that to an ad company.
Finally you return my truck with all sorts of junk that was collected while the truck was being used.