To be fair, few things of any number of LOC have as much utility as the Linux kernel, and it's also a particularly dense example of code. There's plenty of other examples that have higher LOC / utility ratio without being vibe coded. For example, Google's monorepo famously has 2 billion LOC, which is a statistic I've heard long before LLM coding took over.
Clarification: Google claimed to have 2 billion lines of code in their repo ten years ago, and a commit rate of 50,000 changelists per day, both on exponential growth trends.
That's a monorepo with hundreds if not thousands of different applications. It's not even close to an apples to apples comparison.
That's certainly a way to look at it. And that repo contains a "third party" directory which itself contains Linux, LLVM, and much of the rest of the open source world. But I would suggest that the largest of those thousands of applications probably has a transitive closure of hundreds of millions of lines of code.
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