It depends on how the API handles it, TBH.  As long as the data is accessible, that's the important part.  However, I do believe that the account has to be writable, as some data is written to the provider when the drive is mounted (at the very least, for the "attach"/lock file for the drive.    But as shane mentioned, there was a fix related to this in the beta version. However, we've added Google drive to the converter tool, so that you can download the contents, and convert to the local