I have been researching on it to get a blockchain to host files and web servers and pages. I came across to them
They certainly host the web servers for you.I'm assuming they run a private chain which isn't based on ETH or any other coin that is they have created the project from scratch.This statement clearly explains it
BigchainDB is for developers and organizations looking for a queryable database with blockchain characteristics such as decentralization, immutability and the ability to treat anything stored in the database as an asset. Whether it’s atoms, bits or bytes of value, any real-world blockchain application needs performance. A perfect fit for BigchainDB.
From my understanding, bigchaindb is a private blockchain, is it possible for us to create a public group of nodes using their technology?
Public group of nodes ? Since everything runs on a chain,isn't everything connected internally ? That is every node is being served the data someway or the other ? Since they can let you query a database,I'm assuming they have the ability to run a private chain and separate for every database made.