Knowing isn't enough. You also have to organize. Organizing in North Korea or Russia is infeasibly difficult.

> 60% of the North Korean population lives in poverty[0]. Kim Jong-un wouldn't still be leader if his people knew how much better they could have it without his policies.

IIRC, Russia media is basically like having pro-Putin Tucker Carlson on all the channels all the time. And if, despite that, anyone in Russia has even a small chance of actually undermine Putin, they'll find poison in their underwear and get an all-expenses paid trip to a gulag.