My daughter's is in her late 20s, so I am very aware of the online attention-seeking in this demographic. Fortunately, my daughter is focused on other causes, but if you are a young single woman living in a new city and seeking male attention, this is one place to go. And Inanna got a lot of attention--way too much IMO--from (visible) likes to PMs (invisible, but I'm presuming). Her writing style and wit were consistent with someone with a literature degree and I never cared enough to fact-check, since I saw right away that there was a lot of inventiveness in her story-telling. So what--is lying about your family details worse than some of the other liberties posters take with other posters on this anonymous board? This is partly a fantasy world and people are gonna make stuff up.
As for "Stumbly", again, I found his persona interesting and plausible. He took flack for some of his politically incorrect statements about hot women, but this is very common in his (late 70s/80s) demographic. I didn't totally get his behaviour, but he seemed almost too naive and vulnerable to phishing, so I don't know how his character could have added to any nefarious multi-character plot.
Look, if this was all a scam to get money from gullible men, it wouldn't be a surprise in the least. But this board rushes to judgement all too often and has really pounced on this one. If Inanna and Stumbledore disappear forever then the harshest of judgements will rule. But keep in mind that public shaming by your community is kryptonite for lots of young people and that is also a reason to leave Dodge and never come back.