When a million monkeys are typing stories, the odds of two of them being similar enough to be considered the same is _not just_ the odds of the millionth monkey

When a million monkeys are typing stories, the odds of two of them being similar enough to be considered the same is _not just_ the odds of the millionth monkey creating a similar story. Just like the odds of two people in a group having the same birthday is surprisingly low, so are the odds of different cultures coming up with the same story. If you add a bit of selection bias, where you ignore all cultures that don't have a seven sisters story and ignore all the other myths that are not similar and you could end up with this unsurprising coincidence.