Gura's problem isn't some retarded rrats of deep psychology or anything like that. It's something much more common and simple and almost all entertainers and content creators fall victim to it - she became a professional. Early Gura was very much herself and was an amateur, and so was the overall feeling of early HoloEN and NijiEN. These girls got into something new in the West and approached it with worry, fear, but also innocent interest and can do attitude that is typical of beginners in anything when they're interested. You yourself and me experienced this at a new job, the start of a new hobby or whatever other new thing you tried out. But gradually you become good at it and you lose that initial edge and rely on autopilot since you learned enough for it to exist. It becomes a reflex to do the "thing" no matter what it is.
Gura won over her audience because she was just herself. And her person was amazing. As time went on she found herself winning in all aspects as a chuuba, and at a certain point it dawned on her that she is now a professional. And that makes all the difference. The approach to streaming has changed completely, and as a consequence so did the special relationship between herself and her audience. The emotional resonance is almost completely gone. She has become television - there is no meaningful interaction occurring between herself and chat and no matter what you say it'll just get drowned in a sea of meaningless chat shitposts and emojis. She is a victim of her own success, and this puts a gulf between her and us. I stress that this isn't her fault explicitly but seems to happen to every entertainer after they hit a certain threshold and become a "celebrity" or somewhat beyond reproach.
The sad consequence of this is that as mentioned she doesn't really connect with her audience anymore because she CANNOT - she is too big and there's too many of us, and this eventually means her content just isn't the same as the initial draw made it. She is less herself and more a pro, doing pro things, having pro knowledge of streaming. And that is sterile and meaningless and only entertains normalfaggots, who are simply drawn to popular things because they are popular rather than having any authentic love. And this in turn pushes away the initial core fanbase even further away because communication with normalfaggots is meaningless and empty. The same thing happened to /vt/ as well. This is a shit board of SEA trolls, kiwifarm faggots and dramafags. Actual fans of vtubing have nothing to do here. It's impossible to discuss vtubers here.
Finally the inevitable happens, and it's happening to me. I find myself watching Gura only until another much smaller chuuba starts streaming, because there there's actual interaction and emotional resonance. The "moe" appeal of being a starry eyed fan of vtubing, Miku, weebery and so on is now wholly gone from Gura. She's a pro. And as such she is uninteresting and corporate in the worst way.