I thought of this too. A lot of the major SV players (like Airbnb, Uber) make their money based on the fact that they can charge less money because they aren'

I thought of this too. A lot of the major SV players (like Airbnb, Uber) make their money based on the fact that they can charge less money because they aren't paying for the negative externalities of their product. As consumers, we're happy to pay less for hotels / taxis / bike sharing, these companies are happy to make profits. It's a win, win and hence these businesses thrive. However, everyone is participating in a short of cheat, because they aren't paying as much as they should. The difficult part is that these business models seem to actually be really useful, but it would be nice if there was a happy medium between totally skipping out on paying for negative externalities and complete governmental regulation and the ensuing inefficiencies.