How Yahoo lost its way
origin.mercurynews.com
origin.mercurynews.com
This is not a universal rule. Google and Apple didn't deal ruthlessly with competitors.
i imagine it's related to what leads companies into performing feature-by-feature comparisons of their products, as opposed to, say, creating an mp3 player whose design and construction completely ignores every other mp3 player on the market, yet still manages to saturate it