I’m going to call bullshit. Have many Googlers started startups that failed? Yes, but that’s the default state for startups so it hardly seems notable. I doubt the failure rate for ex-Googler founders is any higher than for regular founders. In fact, I suspect it’s higher, if only because they’re probably more likely than the average founder to be able to raise a round, and that likely increases your success rate vs the average startup. But you’re still probably going to fail.
What I take exception to is the 6-7 rounds of funding. A tiny, tiny fraction of companies raise more than 3 rounds, so the idea that there’s a “very large list” of failed companies started by ex-Googlers who have raised 6-7 rounds is total hogwash. Your hand-waving “you’ve never heard of them” notwithstanding.
Stick to engineering, it's better.
I'm just here for the free pizza. :P