That does bring the notion that we can make some assumptions about slavery in prehistoric times; it seems a core part of society in early agricultural societies but we have not observed it so much in hunter-gatherer communities (except sedentary hunter-gatherers with higher population density, which generally do have slavery, so it's more about the settling down rather than food source) - purely for economic reasons; it's practical/useful to keep slaves for farming or mining labor, but not so much for sparse, mobile hunting/gathering parties. Raiding neighbours for "wives" i.e. sex slaves does seem to be a thing even in those societies, though.

It could be a reasonable assumption that the prehistoric agricultural societies had slavery just as early historical agricultural societies, but that the earlier hunter-gatherers, i.e. a major part of those 200,000 years did not have widespread slavery. Well, other than the "intermarriage" with neighbours (often likely not fully voluntarily) which predates modern humans, given the genetic evidence for the partial "assimilation" of neanderthals and other parallel hominids.