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That's a bit insane criticism to lay on him. 37signals is a 27 year old company and Basecamp has been a profitable product for more than a decade.

Success is not measured by the number of people you employ.

Sure, but you wouldn't generally call someone who runs a mature small business a "great business leader".

He's basically just a blogger; no particular reason to pay attention.

That's a successful small business, not a claim to "greatness."