If your advantage is so small that your product can be easily cloned, you are definitely working on a problem that is too small.

Go back and watch a couple SpaceX launches and re-read Peter Thiel's comments on the slowdown in innovation. There are plenty of big problems to solve. The good ones involve contrarian thinking, so are further protected from clones.

Even if you don't want to work on basic advances, at least build a product with network effects. Dropbox and Airbnb aren't rocket science, but their businesses are protected by network effects.