I dunno if this was pointed out here, so sorry if it was, but its very easy to notice how Viv allows her fans to push her around.
I don't think it's a case of fans pushing her around so much as fans working as uncredited writers. I want to give credit where it's due, some of Viv's ideas are very much her own, but there's also a lot of stuff that she's clearly taken from other sources. I can't remember which character it was (I want to say vaggie?) but they were straight up purchased from one of her friends back in the day. I think a lot of characters and concepts are stuff she's absorbed from other creators, and she's talked about her various forms of inspiration as well.
It's pretty clear Viv isn't good at planning, I think she has loose concepts for very specific characters, but the rest is sorta flying by the seat of her pants, so if she hears something she thinks is cool from fandom, she'll make it canon. Maybe the only instance of outright bullying is the stuff with Alastor's race, and even that was pretty soft bullying as far as tumblr stuff goes.
In moderation, I don't think it's the end of the world. Viv certainly wouldn't be the first creator who took ideas from fan theories and ran with them, or relied on multiple people to come up with characters/took heavy inspiration from another source. But when you see how shallow VIv's work is and how much of what actually happens seems to be the result of fan input, it becomes more of an issue. The lack of creativity is easily one of the biggest issue with Viv's work. You have all these fascinating and cool settings/ideas that are set up, and then nothing is done with them or they outright contradict one another or plain don't make sense at all.
Part of the problem is Viv is all style and no substance. She really likes the visual look of heaven and hell and, at a very surface level, seems to like some of the ideas. But it's in the broadest sense that basically boils down to "in name only". And instead of digging deep into any of those things that look cool, she'd rather move on to the next cool thing. Again, I'll try and give her some credit, she'd be an okay "idea guy" in a team, but really doesn't work as a writer, let alone a lead. She needs someone else to take her ideas and expand on them, and in many cases, fans ultimately end up doing this for her.