Jesus what a nay-sayer. I wonder if in early 1999 he would have dismissed Google saying, "A website to search the Internet? Why? I can just go directly to what I want!". Sheesh.
Thanks to the participatory nature of technology these days, its become fiendishly difficult to predict what's going to produce wealth[1]. It used to be easy, wealth was made by growing something and eating it or digging something up and banging it into a shape. It got a bit more subtle when people realized that dragging stuff places (where said stuff was likely eaten or banged into a shape) could create wealth too.…
To give less abstract examples: I don't get paid for being a good citizen, voting, reading the newspaper to be informed. And I do not pay for being angry, putting a lot of strange gases in the atmosphere with my care (yet), congesting the streets. Or putting systemic risk on the financial world.
There is something to be said for connecting externalities with incentives. Giving the right incentives makes people's choices more compatible with the outcomes.