On the guide on their (Storj) website they explain how to share the files. There is also an API so programmers could work on it. I am pretty sure that it is possible to, for example, create a website fully hosted on the Storj nodes. That will increase payments for farmers (people who run nodes).

Anything to say about Filecoin. Just Know that it appeared earlier than Sia and Storj.

On the Sia side, there is already a business working. Storj provides 25 GB for free the first 12 months. I really think Sia will surpass Storj. They also have a **much much much** better interface.

Sia is managed with only an app. Both for uploading files and managing the hosting of other users who are renting yours. Storj provides a command-line interface for the final user and a command-line interface for the farmer (hosting).

Sia asks the user to download the blockchain (which is not the bitcoin one) while Storj doesn't need it as it is not blockchain based.

In Sia everything happens with Siacoin, while Storj final users pay in fiat that then is converted to SJCX -which is a Conterparty asset- in order to pay farmers. This summer farmers will be paied in a new ERC20 token, STORJ.

There will also be MaidSafe (an Omni asset) which wants to provide a real way of sharing files and accessing them. And PIVX, I think.

Just to start, Storj is fine. It doesnt asks for the collateral :)