First, a problem with your question is that it does not provide any context; the question is even somehow presented like an excercise or homework assignment (please note, I said it is presented in this way not that it is one or is simple or anything, it is only about the presentation).
Second, you were asked in a commnet if this is a research question to which you could have replied, yes, it came up in [the context]. But your reply did not do this, reenforcing the idea that indeed there is no research context.
Third, while in view of what you wrote here the PDE tag you used might be correct for the context in which the question came up (not sure) it is not a good tag for the question as asked (without that context) since the question as asked is in no sense a PDE question but a classical real analysis question, so the question seemed to be mistagged.
I did not think about the question and have no opinion on the content, but it is lacking in form, and also good form is relevant. For some advice see How to write a good MathOverflow question?
To answer you question more directly: sometimes, perhaps in this case I do not know, question are also put on hold since the current presentation is lacking. And, there is nothing wrong with this. In fact a main idea behing putting a question on hold is to encourage the person asking it to improve it via an edit. So, instead of editing in complaints you should edit in the context you mention here, and perhaps also clarify what the in my opinion hard to parse (at least uniquely) formulation with the "or" means.
