We're tinkerers - when we see something, we immediately think about how it works under the hood. And because we're too clever by half, we're dogged optimists, thinking there is always a way to accomplish something.
As we mature, we realize that things are often more complicated than they seem on the surface, that often a lot of engineering goes into making something appear simple and easy, and especially, that there is more to the value of something than the effort it would take to build a copy of it.
Perhaps the cliche `success = perspiration + inspiration` needs to be updated to include `marketing`.
Not judging on what is wrong approach or right approach. But startups tend to go after ideas which can get a few million users or generate a few million dollars in revenue.