There are already quite afew: because Storj is compatible with S3… all the desktop/mobile apps that use S3 will work with it. And if it’s for a larger customer like a company, Storj’s own Object Mount makes it easy to share files with teams of people.
But in my own personal view: I don’t think Storj should chase individual end-users: they’re poor and are hard to support 
. Much better to sell to companies and projects that need API-level integration with their tools: because to them it’s a business decision: so they’re willing to spend money to get the storage they need.