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That's for "file storage", aka Deta Drive. Deta Base, our NoSQL doesn't have a limit.

How credible is this, in the long term? Can i use it to build the next Dropbox with unlimited file storage and give it away for free to my users?

I think you've got it backwards. File storage is free up to 10GB, NoSQL is free forever

Their point is they could store the files in the NoSQL solution if they so please.

I’d suspect the free tier has limited performance and bandwidth.