It goes right back to what I see as the central theme that you can't just decide to have a cultural post-everything blank slate: the Vertumna Group tried to flee Earth and its self-destructive systems, only to carry those same systems with them because they're part of the same culture.
And so you get every single one of the Strato children coming right back to Earth ideologies organically, not because capitalism is inevitable but because the adults still cling to capitalistic, hierarchical logics. You can see some of it in Nem, and some of it in Cal and Tammy's relationship, but most of all you see it in Marz and Tangent.
Early in the game, Marz gets the idea to game the kudos system, trading kudos around freely. Tammy sees something wrong with this - kudos are supposed to be doled out for labour and used at the store. This is Marz's first step towards recreating Earth capitalism, the greatest threat identified by the Vertumna Group.
But! Marz didn't get the idea simply because she's greedy or literally shameless. Kudos already operate on a capitalistic logic. They're like money because they are money, invented by people who grew up spending money. And so you get Marz able to afford more luxuries than the other kids, not because she works more, but because her family can get more kudos. She's not playing the system, she's recognizing its true nature.
The government allows this obvious inequality, because everyone gets food, kudos are just for luxuries - but "luxuries" includes everything from dessert to musical instruments to incredibly useful cybernetic devices like the Brain Trainer to accessibility tools like a fidget spinner. And, in the "election," Seeq demands a bribe in the form of kudos, which is completely incoherent unless kudos are already being used as money. It's the same shit from different assholes!
Tangent lives in a constant, hellish cycle of always needing to work. She fixed her body's failings one time with a genetic sex change. But she wants to fix it again by removing the parts of her that aren't productive or rational. I think this is why she shaves her head despite not seeming proud of this choice or wanting to talk about it - her hair, even the feeling of it, reminds her of her humanity, her frailty.
She's desperate to prove to herself that she has a Good Brain because her mom had a Bad Brain and that killed her. And her only metric of a Good Brain happens to be, ultimately, productivity. Where did she learn that from? Probably her de facto mother Instance, one of the last defectors to Vertumna (and thus the most entrenched in capitalistic culture).
Unlike Marzipan, Tangent never has any ideological commitment to capitalism. And yet she internalizes some of its worst ideas, being the single most accomplished scientist in the colony and still hating herself, because she still needs to sleep, even for minutes.
A lot of Tangent's worst excesses seem to come from not being able to just sleep on it. Older Tangent discusses a plan to totally control human reproduction, being terrified that the colony will become inbred. This is projection - she thinks she has Bad Genes, and she can't sleep on that, so it gets bigger and bigger in her mind until she's willing to take extreme measures to "fix" the problem. This plan never comes to fruition, because what the fuck, literally nobody wants this. Eugenics is just one more terrible Earth idea that made its way through the wormhole.
In her best ending - where she doesn't work on the plague and does reconcile with her brother - she contributes her genetic material to the colony, implicitly rejecting that she has Bad Genes. This is the only ending in which she does so. At the same time, she becomes the colony's first psychiatrist, finding high-tech solutions for mental illness.
Because - as she knew even as a little girl - biology never has to have the last word on your life.