Sure first you can just advertise inferior goods. The quarterly thirty dollar boots when people can no afford longer the 120 dollar boots which last years. Later you can start advertising cheap credit to cover daily needs. Then the datamining starts. If people can't provide revenue directly we'll collect so much data that some profit generating stream will appear. But eventually the entire sector should collapse as the consumer won't have money to spend freely.
Not as educated as the other people posting but I always thought that the model under capitalism is just don't be left holding the bag. The people profiting under advertising have probably jumped ship or are planning to before the bubble pops. If some of them are left holding the bag then they can just get the government to bail them out anyway.