Construction of the mesh net which will be 2.5m (8ft) and 20m (65.6ft) - or the same length as a cricket pitch - will begin as early as next week, the official told AFP.
The article addresses this specifically, it’s not ruined because of the market, people want the market in the shot. “The juxtaposition of the soaring volcano and the banal sight of one of Japan's most ubiquitous shops have made Fujikawaguchiko a popular location for photos”
The article said that a lot of their problems came from people snapping photos and getting up on buildings and stuff. I dunno how an 8 meter high net would prevent that course of behavior either, to be honest.