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Technically many could do what dropbox did to create a similiar product when they were part of yc class. Many HN have a personal dropbox setup they made themselves.

The key that allowed them to be a billion dollar business was marketing, hype, strategy all things that could apply to any product technical or not.

If you want to make something similiar you could probably get to 80% really quickly. Putting together a product with a reputation is a different event with timing luck and risk. Building that 80% is low risk but high personal reward.

Has anyone built something to read and identify palms or lines in the hands?