The question I am talking about:
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Ask Ubuntu is a questions and answers site for Ubuntu-related questions. It's also a place to share knowledge about Ubuntu.
That particular question is surely Ubuntu-related - it's asking if reliable estimate of Ubuntu downloads can be made; not about any other Linux distribution.
Now, let's move to the next part which outlines the specific category of questions which are not welcome on Ask Ubuntu.
- Linux Mint, Backtrack, Gnome-Remix (prior to 13.04) and other Linux distributions.
- Bug reports.
- Issues with the next version of Ubuntu (Ubuntu+1).
- Shopping Recommendations
- Support of versions for Ubuntu releases past "End of Life" (EOL)
The particular question definitely doesn't fall in any of these categories.
The other types of questions which are not suited for Stack Exchange network are as mentioned in this Help Center article.
You should only ask practical, answerable questions based on actual problems that you face. Chatty, open-ended questions diminish the usefulness of our site and push other questions off the front page.
Your questions should be reasonably scoped. If you can imagine an entire book that answers your question, you’re asking too much.
The question we are discussing meets all the guidelines (in my opinion). It is practical.... answerable.... as well as reasonably scoped.
As far as my opinion is concerned, it falls within the scope of the site and a good question to have on Ask Ubuntu. Then, why is it attracting close-votes?