Not even the title is modified. Is this acceptable behaviour or is it to be downvoted? Can we allow a dump of such sites?
My suggestion would be to rewrite such questions and acknowledge the source most-likely to be closest to the original author. In many cases, there are dozens of sites with the same text. Having yet another copy isn't really helping the internet be a better place for puzzling. Questions copied and pasted wholesale don't reflect well on this site.
Considering there seems to be a fair number of these on the site already, I'd recommend the following steps:
Users should flag these posts for moderator consideration using the other option. (Please provide a link to the source you found.)
Moderators may decide to delete questions outright or add a citation-needed post notice. (See https://puzzling.stackexchange.com/questions/3416/king-pharmacist-treasurer-and-the-strongest-poison for an instance of the later.)
Plagiarized questions that aren't edited should be deleted within a few days. If this puts an undue burden on moderators, they should feel free to delete immediately. The purpose of a post notice is to give answerers time to fix the problem.
See also What to do about plagiarism?
Plagiarism is not okay. Please refrain from plagiarizing content from other sources, as it will be deleted. If you can obtain permission from the linked site to use this puzzle here, and provide proper attribution, then you can flag this post for moderator attention so it can be undeleted. For now, however, I'm going to delete this question.
(link to my comment, only viewable with 2k rep or above)
Post nuked with extreme prejudice.
This user seems to make a habit of posting non-original puzzles as questions, without attribution. That's plagiarism, which is not allowed and not cool. I had a look at a few of his questions, and all the ones I saw were puzzles found in hundreds of places on the web, with answers that are good but not exceptionally so.
I say delete them all. While editing a plagiarized post to add an attribution is sometimes desirable, this is not the case here:
- The content in question has been plagiarized so much that the original author is hard to find.
- There are so many copies of it on the web that we don't need one more.
Going forward, this illustrates the need for quality control on questions. For puzzles-as-questions, is the question a mere puzzle dump or does it add an actual question? If the puzzle isn't attributed, does it look original? If the question is a plagiarized puzzle, don't waste time answering (and repeating what is typically found on hundreds of websites): downvote and flag.