I am a bit hesitant to bring up this issue, but since it does bother me a good deal here goes. It has similarities with this other meta question but with a more objective edge maybe.
It is a fact that there is a handful of users on MO which have cumulated lots of questions with negative votes in recent years (some users have dozens each, not counting such questions that have been automatically deleted by the system). It is evident from the wording of those questions that they are not research mathematicians (vague or non-standard terminology, very little preliminary efforts and understanding, and so on...). They are particularly present under the nt.number-theory tag.
Since negative votes are a way of telling the OP that the question is not fit for MO, the least this handful of users could do is take it respectfully, that is learn from it and refrain from posting on MO similar questions (i.e. first post on MSE if unsure about relevance or elementary background).
As seen in recent days, some of these users keep on posting such unsuitable questions, somewhat polluting the nt.number-theory tag.
Is there something the moderators can do about it? Like automatically routing these users' questions on MSE? Or automatically hidding questions that get 2 or 3 downvotes in the space of some short time span?
Indeed, while simply not reading these questions is perhaps the best course of action to take, this can only be done if (a) one has become warry of certain user names, or (b) several downvotes and/or [On Hold] tag serve as a warning. And so I am wondering whether colleagues that are newcomers or non-regular users may get a bad impression of the site after innocently reading a few such questions in situations when neither (a) nor (b) can help them.