The issue about reposting is not being transparent about the post being a repost. Some curation communities take into account the novelty of the post vs repost. A repost is unlikely to receive an upvote from the curation groups if it was known (if it's part of their curation criteria).
You can still repost without telling anyone it's a repost. I don't think it's right to tell people how to run their blogs because it's their business. Just don't expect getting the support you would usually get for novel posts.