They copied millions of posts to their 'new' chain but not the related funds of all accounts that created those posts.

Even if they had copied the current balances it's not clear that would be fair compensation for copying old post content. If user A and user B both had $20 in liquid rewards from some pre-split post, and A traded their $20 for some bitcoin while B held it as SBDs, after the split/copy B would have gotten "paid again" on the new chain but A wouldn't have, even though their posts were equally copied and presumably equally valuable. Starting from scratch would have been the most legal and ethical approach, but they didn't choose that route. I'm still a bit surprised that there haven't been any copyright claims filed, although maybe that is happening quietly and I just haven't heard about it.