Abusive scenario about de-duplication

Does this count for SD’s as well? If so, it wouldn’t be possible to use forward-referencing SD chains, where the next SD is posted with as identifier the hash of the previous SD. When trying to GET the entire chain one would get disconnected after trying to GET the non-existing SD after the last one.

That would be quite a pity, since we need forward referencing if we want to create truly decentralized linked-lists for decentralised discussion threads and such.