Call it a "benefit" of technology. Instead, what we're discussing is the conduct of simple business transactions and prices. External cost has been in the discussion since Love Canal.
I sell you "wonderful shee-it" which I make in my factory. My factory spews terrible shee-it into the air, which is "collective property." You breathe in the terrible shee-it, get asthma, go to the doctor, incur medical costs, die sooner. My factory should've captured the by-product of my wonderful shee-it and disposed of it at the cost to me, the factory owner.
Instead, I used your air for a cesspool or toilet. Until I'm compelled to "clean up my f-act-ory," the price of my wonderful shee-it will be lower. When I clean it up, I pass the cost on to you, but you agree to pay for it, since you're buying my wonderful shee-it as a matter of choice. And people who just don't like my wonderful shee-it don't have the cost of the pollution passed on to them in spite of their preferences.