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Almost all the girls are here, this place is their main source of audience feedback, there is a channel on their discord full of screenshots from these threads where they discuss important criticisms.
First one is easy. There is SHE'S HERE posting about every single HoloEN girl, about some more than others, but still about all of them. Many anons have compiled evidence for one girl or another.
Second one follows from the first, if they're here they see our criticisms (it would be hard to miss them). There isn't any good criticism anywhere else on the internet so the stuff they see here would dominate by virtue of quantity, accuracy, and usefulness.
The third one I know is a reach. The only strong evidence I have for it is that screengrab Ame posted on Twitter that is an identical image to one posted from the thread. I'm assuming she got that from their Discord, and that means uploading stuff from 4chan to their discord is common enough that when Ame grabbed a good image from their Discord, it just so happened to be one sourced from 4chan.
