https://quillette.com/2019/10/29/polyamory-is-growing-and-we-need-to-get-serious-about-it/

Poly also lacks the legal status of being a protected minority, so poly people can be denied housing, jobs, and child custody just for being poly. The political status of polyamory is comparable to that of homosexuality before the 1969 Stonewall riots that launched the gay rights movement.