Serious question is the Hazbin Hotel mostly made up of children in the fandom even though its an adult show because it feels like it - and I think that might say something about some of the more questionable choices of that entire -...[gestures] well you know.
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But there are certainly plenty of adults who watch it, wether they are in the fandom or not
A good chunk (maybe 89-90%) are adults who don't want kids interacting with the show or it's spinoff (Helluva Boss) in any capacity.
Kids are just noisier online for whatever reason.