"fascinating" is meant completely sincerely. Fascinating to finally meet those Wrongbad Problematic Fics I'd heard so much about!!
In the Buckyfic Universe, the dialogue of different storytellers has produced this, insanely gnarly and layered network of agreed-upon concepts and tropes that kept getting iterated upon and branched out from different story nodes that form new kernels of story.
so, okay. Hydra Trash Party is not a general MCU darkfic tag, even though it was described that way in the post that coined the term "dead dove". It CAN mean a variety of broader things, but it mainly refers to fics where Bucky, when he is the Winter Soldier, is raped by his handlers
The tag and the story-node in the story-thicket are different things, though. An absolute shit ton of fics that aren't Hydra Trash Party in the sense that they deal with sexual violence graphically and as a main theme, accept this as a key part of Bucky's backstory
The story-thicket has converged on these themes relating to the survival behaviors of abuse, dehumanization and powerlessness, and created a bunch of elements or story-nodes that appear in dozens of different fics without appearing in the source material. I wanted to give a couple examples but I thought of too many so here's a list
the Winter Soldier is referred to with it/its pronouns (absolutely fucking everywhere)
He's forbidden from using first-person pronouns
He's forbidden to have preferences or desires, and panics whenever asked to make a choice
after being rescued from Hydra, he thinks his rescuers are his new "handlers" and they will abuse/punish him, so he is constantly trying to placate them and figure out the "rules"
he offers himself to be punished after he thinks he broke a rule
he thinks he's a machine and not a person
Hydra bathed him by hosing him down
There's a subset of fics where the Winter Soldier can't remove his mask or it is somehow attached to his face. It's not super common because it usually does change the canonical identity reveal, but a lot of writers have unrelatedly picked it up
castration, chemical or otherwise
vivisection and/or being used as a lab rat
Hydra exclusively tube fed him so he can't eat solid food after he's rescued. these fics have SO MUCH PUKING it's unreal.
In some areas of the story there's a ton of variation, in other areas there is a lot of convergence. it's neat