The idea that sapient automation kept as property is an adequate analogue for slavery has been a luxurious staple of white sci-fi authors since Asimov. And like them, Cage thinks he's treading revolutionary new grounds. But it is nothing but a vapid premise, swapping out the systems of power that subjugate and marginalise real people for 'nonpeople' and their fictitious battles. Using 'robots' as a stand-in for 'people you normally can't empathise with' is pretty bad already, but he manages to screw even that up.
Rather than act as a metaphor, the game introduces a clear dichotomy between 'humans' and 'androids'. The humans in this narrative have no (worthwhile) structural problems to speak of, apparently having banded together and only existing to commit violence against androids. The central message seems to be "humans are all the same, and they're all bad for beating on robots. Robots are the real humans, for being victims."
Androids, then, don't represent anything. They exist as a loose concept of what an oppressed group is. Everything that Cage writes about androids is what he thinks oppressed people are, but without having to do justice to any real history or reality. When you have a 'robots are people' story, you essentially have an array of affectless bodies. Because we know they're not human or organic, basic morality or ethics do not apply to them. This serves Cage's dull-witted narrative style: it gives him the excuse to do whatever he wants to them. It constructs a template victim that exists in an ahistorical vacuum. There are two glaring problems with this.
1) The invention of an ahistorical oppressed group suggests that the awareness of difference is the sole result of violence, as opposed to structural violence being a reaction to difference. Essence precedes existence and all that. Androids can't possess a culture or a social locus of their own, because they're robots. So the only way that marks them as different and oppressed is the violence that is inflicted on them. It humanises robots through being victimised while totalising oppression as suffering. Kara has to take the brunt of domestic abuse in order to 'achieve' autonomy. Only cruelty is that which lends credence to and defines what is an autonomous identity. This is, of course, patronising and reductive, regarding the oppressed as lacking community, culture, history, agency, or any sense of self outside of being oppressor/oppressed.
2) Having a templatised victim assumes a generalised oppressor. Suddenly, 'all of humanity' becomes a faceless, yet pervasive antagonist. It dehumanises people through their violence. Everyone becomes complicit in and culpable of perpetuating these violent hierarchies. It is intentional that in the game, many people of colour are shown participating in violence against androids. Cage seems to say "look at these hypocrites, doing what has been done to them." It acknowledges that racism, classism, etc., exist — we get snippets of massive economic collapse and widespread poverty. But it simultaneously concludes that these are relics of the past that don't matter. The new and only real problem left is 'robotism'. This is as intellectually tortured as it is historically revolting.