This is a very, very good question to be asking. Though I have a sneaking suspicion that the actual offending content will not be stored on the Hive blockchain itself, as the blockchain does not store images. Any reference to such imagery would be a link to where it is hosted somewhere else. If that were to happen, odds are good all the front ends would decline to serve it, and probably alert Interpol to the link's existence. From there, they've done their due diligence and they don't necessarily have to worry as much.
As for SPK, they're going to be the ones who will have to decide what to do if the images/video are uploaded and stored on their servers. I suspect there will likely be a ToS addendum somewhere to prohibit such obscenities.
The spknetwork will be decentralized so they cant decide what go up or not. The IPFS system is already out there.
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That will complicate things...