Theoretically, vim is supposed to be used to specify that the question is specific to the Vim, that is, Vi IMproved by Bram Moolenaar.
However, it appears that this is rarely the case in practice, and I don't think it will be the case in the future either.
Almost all questions tagged vim are not actually specific to Vim itself, and new users shouldn't be expected to know the exact usage guidelines that are rigidly expected.
So, a proposal: Burninate and blacklist vim. Nothing good can come of it.
(Secondary proposal: Possibly create a new tag vanilla-vim or something along those lines, to signify questions that are indeed specific to only Vim, such as What is Neovim? How is it different from Vim? And why should I care?.)