I have been thinking about the same and my thinking has been trying to leverage Google Drive, Dropbox for the user to store the data, this way they would own it

I have been thinking about the same and my thinking has been trying to leverage Google Drive, Dropbox for the user to store the data, this way they would own it all, but it seems weirdly complicated since you would have to support multiple and you would not earn any money or you would still have to store user data.