[_wo6a]

Side note: quick research seems to indicate that it may not actually be Genghis Khan who is the male-line ancestor of all those men, but a common ancestor of his and the rest of his tribe. https://en.wikipedia.org/wiki/Khereid

Even if so, I'm not sure if he would actually be an example of the low-investment male mating strategy. He was the ruler of a large empire, so he would be able to invest in his children. Even those who weren't recognized would have advantages from being rumored to be his offspring.

Groups which allow the low-investment strategy are outcompeted because they don't incentivize any males to invest in the group, while the Mongol empire had plenty of conquered people available to the Mongol men who were excluded by elites' polygamy.