in this case, i agree with both wowitstea and sslainsaturn;
i too have seen people in the yandere community being polyamorous, but none of the poly relationships lasted long. members of the yandere community don’t equal being yanderes though, at least from my POV they weren’t.
i can’t grasp how yandere poly relationships work - i’m sure they do in some cases but.. with how possessive yanderes are, do they just split attention equally? it’s not always just about one side either, communication would be hard. for example: said poly yandere person’s partners are darlings - are they really 100% fine with others around their yandere too? it already sounds hard to me, i can’t imagine it working in practice.
i'm not absolutely against poly relationships in general - if it works for you, great. i think even if i were polyamorous, the jealousy would eat me up first. in my understanding, a true yandere cannot have a poly relationship.