[mixmixmix]

> #25 Don’t build something that already exists. Customers won’t buy it just because it’s yours.

Not a good rule. I know many guys that are making serious money because they improved something that already existed.

[swah]

Opposite view: building something that already exists is the easiest way to know that there is a market. Then try to steal the market from other players with a better product.

[pavlov]

They didn't just build the same thing - they improved on it in a way that customers understood and wanted.