Sia could probably run on Bitcoin or Ethereum, but that's not relevant to the question. Blockchain smart contracts enable file contracts and other features that

Sia could probably run on Bitcoin or Ethereum, but that's not relevant to the question. Blockchain smart contracts enable file contracts and other features that make Sia work. The smart contracts determine how hosts are paid, what happens if they lose files etc. Everything just works without any central authority or payment processor because of the blockchain. https://support.sia.tech/knowledge_base/topics/why-do-you-have-your-own-coin-and-blockchain https://support.sia.tech/knowledge_base/topics/why-do-you-ha... To the first question: "Sia" doesn't have to defend anything, because Sia is software, and not a legal entity. The developers have no control, authority or ownership of the network, and thus are not legally responsible for the contents. Individual hosts are responsible for the content that they host, and will have to respond to legal queries and remove illegal content.