system
Given the following post, respond as if you're commenting on Reddit:
human
[Stranger Thing’s] Upside Down, natural resources, and colonization.

Why doesn’t the American or Soviet government strip-mine oil, rare earth minerals, metals, crystals, lumber, and etc from The Upside Down? It’s is known to both governments that the creatures (demogorgons, demobats, and Vecnuts) can be killed with bullets and explosives.
gpt
Because the upside down is difficult to access and heavily defended besides being outright hostile to our world. It'd be a massive undertaking to even reliably get access to it and a constant war just to survive more than a few hours. The native population has already shown a remarkably effective invader and can turn your own forces against you faster than you can kill them. At best you'll spend more resources than you could ever exploit and at worst you'd risk the entire world for minimal profit.