>not true, when colonizers leave of their "own volition", it's usually with a puppet government left behind called "friendly" that's essentially a proxy for colonial extraction.

When and where did that happen? When colonizers were kicked out by force, radical nationalists took power on the basis of "kicking out the oppressors/colonizers" who 100% weren't puppets of the original colonizers, but the contrary.

Case in point North Korea, Cuba and Iran and many African countries. Those regimes are 100% not US/UK puppets and yet they don't treat their people much nicer than they were under US/Western rule they revolted from. Quite the contrary, they're even worse off, because they don't know how to manage a modern industrial economy without the colonizers which originally built it.

USSR soviet Marxist communism was designed as a antithesis to US/western capitalism, and its workers ended up more oppressed than workers in the US, and the USSR was a world power, not some small powerless country like Cuba or Iran that could be bullied by US sanctions into poverty and submission, so its poverty was entirely self inflicted by the mismanagement and incompetence communism and anti-capitalist systems of governance inevitably bring which only end up functioning under oppressive tyrannical rule, until they inevitably collapse.

China became a world power from a starving nation, because it also abandoned centralized controlled communism and switched a lot of its economy to free market capitalism under the rules of the "evil western imperialists colonizers" because that's better and it actually works for lifting people out of absolute poverty. Chairman Mao's policies only created more poverty.