The cause is different from Julian. This might benefit the cause, yes, but Julian is already in the hands of the government. He is in jail. If the fate of Julian is not as important as the cause, he can rot there, for all we care. But if people care for Julian, perhaps they won't stoke what's considered to be a dead war.
My views are rather because they care for Assange, they reshare and resound these things again which is indirectly intended to support rejecting Assange's detention and, especially in this case, the extradition request. Not specifically waging a dead war.
Leaked materials are far better than useless ape jpegs. Nobody would join a movement broadcasting transactions involving poor artworks. Many might, though, if it involves information of war crimes committed by no less than the government.
Still, I do not see the government would be willing to initiate this project. Not to mention this is limited (max 76,911 inscription), so random jpegs would last longer if their goals were to clog the networks.
I show that reference specifically to support the authenticity of the leaks.
Regarding the project's inscribed information itself, see:
The are 76,911 available data to be inscribed. Users can publish a maximum of 300 logs per transaction.
You can play around on the site, to see the calculation of how much block spaces it consumes per log.
https://projectspartacus.org/Publish