Why on earth would you use Bitcoin as a relay when you can use Mainline DHT? Or Bittorrent with trackers? If you are ok with the data once confirmed, then you have to realise the relaying doesn't do anything whatsoever that is attractive to spammers, they don't want to relay their Jpegs, they want them to be included in the chain ... And if Bitcoin was being used more even that would quickly become too expensive that they will go back to using hashes + IPFS or Bittorrent. Again, your node relaying Jpegs is worthless and no one will care about it least of all the government... When they have much bigger fish to fry; the fact that you are relaying money transmission messages, possibly to the benefit of their enemies