I'm not the mod who deleted it, but its clear why
While it was a ambiguous somewhat vague question, that required a certain degree of context to understand the intent was fairly clearly not what a Mac Address was -and someone else clarified it with an edit, so it wasn't that obscure..
I suppose the lack of downvotes was cause downvotes cost rep, and comments and flags are free. Its just human nature. I'd add I'd have downvoted it if I was a regular user, but there's no specific need to do that.