Hey, ipfs dev here. In filecoin (as in sia, and most other decentralized storage networks) the client who is storing data has control over who stores their dat

Hey, ipfs dev here. In filecoin (as in sia, and most other decentralized storage networks) the client who is storing data has control over who stores their data. It's a market. So for example, if a well known company decides to offer storage through filecoin, they can publicly attest to their miner IDs, and you can choose to make deals with them for data storage (even at a slightly higher price if they want to charge it). Separately, we are working on schemes to allow miners to only serve a clients data in situations they approve of (authorization/authentication). This would address the problem of the data being 'public'. If you can control who stores your data and who can access it, it has the same attack surface as any traditional cloud storage provider.