Welcome to the field of Applied Psychology and Cognitive Science. Once you have reverse engineered the mind, the only practical application is manipulating it.
>just as likely that modern marketers are just doing what people want
For a TRILLION dollars we are not talking about "marketers" in the Mad Men, I-made-a-website-and-wrote-a-book, or "social media expert" sense. We are at minimum talking about behavioral psychologist PhDs and global corporate parasites like Coca Cola, Philip Moris Tobacco, etc.
In reality, those are still on the billion dollar level and not on the top of the food chain. The only trillion dollar companies I'm aware of though are financial institutions, so that would be my criticism of the article. If you really want to make a trillion dollars, you'll need to be much closer to the monetary spigot. In other words, a bank.