It would seem only Steemit uses the caching server img1.steemit.com, because, well, it's theirs.. Steemd just shows the post as it is in the blockchain, which is the unaltered image link.
The thing is, is that all the posts are on a public decentralized blockchain, so it's hard to track who has accessed it. You would have to make it a private blockchain, and count all requests to retrieve a post. Even if this were the case, you would have no way to track any copies of the data made after the fact.
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