Capitalism is fundamentally invested in notions of scarcity, encouraging people to feel that we never have enough so that we will act out of greed and hording and focus on accumulation. Indeed, the romance myth is focused on scarcity: There is only one person out there for you!!! You need to find someone to marry before you get too old!!!! The sexual exclusivity rule is focused on scarcity, too: Each person only has a certain amount of attention or attraction or love or interest, and if any of it goes to someone besides their partner their partner must lose out.
Parnia doesn't find every aspect of polyamory to be as ideal as her own personal experiences. As a woman of color, she's particularly tuned into the racial blind spots present in many media representations of non-monogamy. Lamenting that mainstream representation of non-monogamy tends to center around white people, she says, "White people have also Columbus-ed polyamory to be a revolutionary tool, claiming it to be political, yet centering it around sex," continuing on to cite the fact that many non-European cultures have practiced some sort of polyamory far before colonisation.