It's a great point you've raised, I think what happens most across Hive leads us to two points:
Should the community ban these types of posts at all costs? You could put that as a clear rule, then that ban could be downvotes or silencing both the author with the curation profile, and silencing in the community. That way, people would be discouraged from making such posts.
The other point is that you want to see what all the authors have to offer, even if it's something plagiarized or copied and with references, like the case that started it all. You then say fine, you can post whatever you want in my community, but you won't get a vote from the healing account and other members will be discouraged from voting for you.
I see these two points, as we can't ban anyone from a certain community, I think it's impossible to control what the person will want to post or not, so what can be done is to put as rules that this type of post will not be accepted and if the author posts, simply skip it.