But that's not where others failed. Instead, it's coming up with the idea, realizing that it's a truly good idea, that was the important thing. (Remember, Yahoo and other(s) didn't want to buy Google and the algorithm, when they had the chance.)
Maybe if you replace "totally low hanging fruit", with "It was undiscovered winner-takes-it-all markets" I'd agree.
In hindsight, everything is obvious. But initially, discovering that opportunity — looking at how many people (how few, just 2) did, it wasn't easy.