Definition of quality contents

Question

I wrote a small puzzle, which was downvoted badly either because not many people understood it or it has severe content quality problem. I assumed the second and raised a flag to request the post deletion.

Moderator response for the flag is:

declined - your question has upvoted answers, and we prefer not to delete others' high quality content, if possible.

I remember the question Problem in the middle of desert was deleted which had even more upvoted answer. (The answer I gave had ~50 net upvotes).

So what prevents first question from deletion while the other was deleted ruthlessly?

Answer 1

The "Problem in the middle of the desert" question was actually deleted because it was astroturfing a particular website, not because deletion was requested. That was one of many questions coming in linking back to that particular site.

Either that, or it was plagiarism, which is deleted.