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?

Maybe we die out because we failed to take care of the planet.
More like because we failed to take care of ourselves, by taking care of the biosphere we relied on to stay alive.