Private file server storage for decentralised applications

I'm trying to determine if the project I'm working on is a useful idea or if I'm wasting my time. Any feedback is welcome.

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There are open decentralised storage networks, permissioned key-pair stores on ipfs and decentralised data marketplaces but afaik nothing that allows dapps to use existing private servers to store data. Reasons people might want to use a private server might be:

• user is not comfortable storing sensitive data on an open storage network despite it being encrypted
• company wants to step lightly into decentralisation while using their existing infrastructure (to minimise risk)
• individual wants to host their data themselves
• user wants to expose an existing data server or database to different dapps
• dapp needs temporary storage
• developer wants to be able to grant access permissions to specific users and revoke them later

I'm developing a platform consisting of private end-to-end encrypted servers that use smart contracts for file access permissions. It enables file access controls to be part of a dapp's application logic on the blockchain and allows any private file server that is compatible with the protocol to be used for off-chain storage. For example, a cloud service could offer generic private storage vaults for all dapps while a company could host a messaging dapp for their employees on their own servers.

Example todolist dapp is here if you want to know more: https://github.com/Datona-Labs/example-todolist

Possible uses:

• Private user account data for dapps and websites authenticated with pkc
• Giving customers access to read, update and delete their data for data protection compliance
• Sharing private data between users (e.g. messaging, secure file sharing private social media platforms)
• Syncing dapps between devices
• Paywalled content
• State-transition based access controls
• Backups