So it is up to the Community to filter out crossposts, but instead of downvoting, let the user, who find the duplicate make a Reply in which he points out the problem, because there are lots of reasons to downvote the post beside copypasta.
I think average Steemit reader do not waste the time for identifying the source of the post, he/she just read :-)
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You are probably right. Generally I only check for crossposting or plagiarism on high paid articles that are well written, since they are the likely candidates.