Current, sure, but he showed up after Google was already successful. Becoming the CEO of Google made him successful, but he didn't make Google successful.
> Apple's current CEO...
Same thing.
> Jobs, the founding CEO, was also not a software engineer.
True but he co-founded it with a software engineer (Wozniak) who was arguably influential enough that he had the influence of a CEO if not the title.
> Amazon's CEO, Bezos, was a software engineer
He may not have held the title or had the function, but apparently he had the knowledge.