Not to me personally, but I've seen vagueing in the wild.

I think anyone seriously complaining - particularly in the way you describe - is an entitled brat and needn't be catered to. Even if you had more fandom presence, they'd probably complain there isn't enough for fandom/characters they matched on in there (very likely for YT fic in particular, considering). Probably fishing for excuses for their own struggles with coming up with a story. Mark them as people to avoid and move on.