this is why nobody likes you poly people.
you force your views onto a yuri that is not poly,
you insult everyone who disagrees with you,
you insult everyone who tells you that you are being delusional about the poly in a yuri,
and you keep doing this on almost every single yuri that has more than two main characters.
get some help.
I can't tell if by "poly people" you mean "people who are poly" (in which case,what is wrong with you) or "people who hope for poly resolutions in romance manga".
If the latter, I can tell you that poly endings are so rare in manga that no one
expects them. But often it seems like it would be a resolution that would be the most satisfying and leave the greatest number of characters happy, so people
hope it will end that way, even if it's unlikely.
I don't see anything wrong with that. People speculate about where stories will go all the time. And given the extreme paucity of poly endings in manga, as evidently few authors have the guts to stick with a non-traditional outcome, there's a lot more of a desire for such endings than has actually been fulfilled. Basically people are hungry for the unmet need.
If there were a bunch of poly romance manga out there and you had people flipping their shit about monogamous stories not also going down that route, then you'd have a leg to stand on with your complaints. But that's not what's happening.