8/10 companies on your list are software companies, of those 7/8 have software engineer CEO's. The only thing you've shown is that successful software companies are often led by software engineers. I bet you'll find similar patterns in other industries. Who better to have visionary leadership than an engineer who grasps the industry perfectly.

I'd love to believe that software engineers make better CEO's in general, but you'd have to show me a list of companies that became successful only after hiring an ex-SE CEO, and preferably in another industry than information processing.