Hi Kpark,
We don't actually save data directly on the blockchain, it is standard practice nowadays to store data off-chain. IPFS is getting pretty well known for distributed data storage and anyone who wants to run a node can. That ensures democratization, but we'll probably need to seed the nodes ourselves at the beginning while more entities become interested in hosting their own.  All data is fully encrypted and only the hash referent to encrypted file is posted to the blockchain.