Comment by TekMol

    How, exactly, does this system
    help with RSS in any way?

You cannot make a Twitter-2-RSS bridge because Twitter block access to the data. In a decentralized system, access to the data is inherent.

    Even when The Pirate Bay remains up,
    that doesn't mean anybody's seeding

That is where the financial incentives come into play. Seeding will be economically incentivised.

    If all the data is directly on the
    blockchain, nobody can actually
    download it all

Blockchains have come a long way since Satoshis version in 2009. We have approaches now where participants only need to download arbitrarely small parts of the chain. Yet the network as a whole keeps the chain intact.