I agree, you are right, but... it would have to be marked at the beginning that the content had been reposted and the original link should be included. Then I don't see the problem. It reminds the situation when the content is shared on another platform and here, but without using #steemexclusive tag. Nothing wrong in it, as long as you inform about it others.

The problem is when someone tries to hide it. Reposting content between the communities does exclude from booming/SC upvote for that specific article. Here somebody got the SC upvote for the text which was already curated by another whale in the previous community.

Marking reposted article properly does not exclude regular upvotes though and is not against the rules. Banning for reposting (like in that case), if it's not made constantly, in my opinion is too much. Warning would be okay. It's up to the admins though, they make the decision and I respect it.