In most of the world by landmass and population it doesn’t

As anybody with dual citizenship has the passports to prove it, Jus Soli is only half (or a third, for triple citizenship) the story.

Anyone with a dual should give one to a stateless person. The group no one talks about.

That's not how nationality/citizenship works, is it?

Not saying they could but think of how many people have more than one citizenship and how many have none. Without a state you are shutoff from everything from the internet to basic rights or a legal place to live. Existing is most likely violating someone's law

That only leaves

- the rest of the world

- the fact that right to nationality is not the same as having it. France has the same right, but --as I already pointed out-- there are quite a few people born there who didn't take the nationality

- the fact that it can change, and that the inference becomes invalid in the future