- Catalyst servers, a cdn run by anyone. People can contribute network bandwidth and storage to make the virtual world exist. Similar to Bitcoin's nodes or BitTorrents' seeders, it prevents one single entity from being a chokepoint for content delivery.

- It's fully open source: not just the client but also the servers and "the database" (it's the data on the blockchain that matters, not some opaque database that can be modified by a comoany)

- Economics: freedom from LindenLabs manipulating the tokens or virtual assets (or at least full transparency if that were to happen)