All humans who have ever lived

https://infosec.pub/post/14030463

All humans who have ever lived - Infosec.Pub

The visualization is strange for this because the hour glass implies that the is a finite number of humans that can live but at the same time it is refilled from the top continously.

What happens in a billion years will it overflow?

Am I the only one with this problem?

Currently our world wide birthrate is trending towards an average of 1.9-2.1 children per woman, which is basically just enough to maintain a stable population. The main reason we exploded in population in the last couple centuries is that our kids stopped dying so frequently, so as people notice that they no longer need to have 15 kids so that 3 of them make it to puberty, they stop having huge families.