There are all sorts of products that are made before there's any obvious demand for them, then the demand explodes. One way to get very wealthy is to identify something that consumers want that they don't even know they want yet. Looking at Google, for example, that's 57,000 jobs (many of which are high pay) that were created to develop products that people didn't even know they wanted until they were there. A number of the investors got very wealthy as a result of this and obviously did create jobs.
I think your mental model of how this works gets the horse before the cart.