That's something I was thinking about also regarding plagiarized questions, but with spam and nonsense questions that you can read with tens in just a few minutes I really don't know what we can do. It's weird that some of them are even being upvoted so sometimes I am thinking on what criteria is @musing casting votes or if it happens randomly.
The idea of musing is great, in my opinion, and it will be used more and more, but I also see the increasing spam and other related type of content flooding it even from the beginning. However I do believe that the team from musing is "not sleeping" and will not let spam ruin the project.