>>6712738
Some of them are some of them aren't, but it's also common practice to not break containment either so some of them probably are here but ideally would never want you to know.
Considering Finana was a literal literal who vtweeter before debut she didn't really have a lot of need to keep up with this place much because nobody knew of her. For indies who actually were something before it seems many if not most of them are at least aware of here if not lurking/shilling. So I can see her being aware of here but not really here-here, she doesn't really talk like it and neither does Elira. Pomu does though, but there isn't much doubt Pomu is an old school 4chins user to begin with from her tastes/sayings etc on /a/-/jp/ matters.
With NijiEN in specific, considering how many indies shill themselves here and that indies nowadays can go on to become potential Holos and Nijis, it'll only be more common with time, not less.