A riddle was recently posted, but it seems to have been mistakenly deleted as "spam". As with many puzzles on Puzzling.SE, it was an original creation, posted by the person who wrote the puzzle. In this case, the same person had also published the riddle elsewhere; however, a link was clearly displayed in the question to avoid plagiarism and to be transparent.
The question was posted from the account @MinderDaemon, giving full disclosure of its affiliation to the Riddler's Den and to some other PSE users (including myself).
We were familiar with https://puzzling.stackexchange.com/help/promotion, and we made sure not to violate any of the guidelines. Most of it concerns answers and not questions (Puzzling is such a special case within SE!), and we do not "talk about our product/website too much" - we post our own riddles using @MinderDaemon and only mention the site in the most minimal possible way: by providing a link to avoid falling under "plagiarism". The question is a completely legitimate challenge riddle.
There are many riddles and puzzles on this site that come from other sites and textbooks, and some (such as @JoeZ.'s questions from his own website The Temple of Quetzalcoatl) have been published by the same person on PSE and their own website. So long as attribution is given, there have been no consequences.
Firstly, why did this particular question get deleted?
Secondly, with a view to establishing Puzzling-specific site policy, does the community think that challenge questions posted here and also elsewhere should be deleted as spam? (If so, @JoeZ. beware!) Or should they be left alone?