If meth were a liquid market with dealers lining up on every single street corner in the city to sell (and probably stocking it in grocery and convenience stores besides), then yeah, his stopping wouldn't really change the situation. His monetary loss from stopping sales will far outweigh whatever infinitesimal decrease there will be in the convenience of finding an addictive game on the iTunes app store.

This only holds if meth and playing flappy are on par in terms of damaging your life.