Simple and easy to understand. The controllers manage this world like sheepfarmers

They been doing it the same way without problem
for thousands of years
Start off with a few hundre quality lambs on decent grasslands
Exploit the sheep to the max
He controls them easily with dogs and shotgun
He thins out the herd or kills them all off if he wants a change of breed or better grasslands
It's easy and straightforward

Exactly the same with humans
After the last reset 100s of thousands of children are released along with some favoured adults to manage and educate them
These children have been defeated from the start
Their controllers have all the wealth and resources to stay on top of the growing population
When they outlived their usefulness they are exterminated