You're right here. Every person that sees the money flowing and focuses on that will lose out on actually making something people want.
It's easy to look at a startup space and see which companies get it, and which are there because the probability of success (due to focus on that particular market from acquirers and VCs, market size, etc.)
This article is kind of scary because people are taking the approach that entrepreneurship is something that everyone can do. I think everyone can try (and would advocate for it) but this type of attitude normally precedes many failures.