Maybe you know better and can educate me.
Are there corpos that make use of open source in egoistical and asocial ways? For sure. But that doesn't mean the working conditions of those working those projects are even in the slightest like slavery or colonialism.
Even if we talk about it on a birds-eye view level of human beings exploiting the work of other human beings the difference is that software doesn't go away when more people use it. It is not the same as going aomwhere and taking the land of some indigenous people. Also open source developers (unlike the subjects of colonialization and slavery) can always decide to just walk away from it.
I don't think GP was. A lot of people with different past, culture, ethnicity and ideologies than theirs have also never been exploited. One thing doesn't exclude the other.