It's that poor nations are not exploited by global capitalism.
Then you can look up TED talks by Hans Rosling, and the follow-up reports for UN millennium development goals.
The pleasant, unintended side effects of globalist capitalism and economic liberalism are in fact not that much a surprise. Just look at the track record. Is it bad if good outcomes follow as unintended consequences?
Arbor ex fructu cognoscitur.
Venezuela wasn't a poor nation to start with, but is becoming one in its urge to fight global capitalism.
You could also look at countries in Africa that don't have extensive resource extraction (compared to those that do).
But given that utilising or even tolerating slave labourers on the ground in democratic nations is such a shameful thing, it might be better to actually let DPRK be completely isolated from global economy and not allow any of these arrangements. Even if that results in more misery for the people in DPRK.
If you know of other instances of this that'd be a fascinating topic to read up on.