Right now, we're storing all mote content in AWS public cloud.
However every URL is randomly generated and is not publicly discoverable (to the best of our knowledge - certainly not by Google bots).
We store all mote content in this way because we don't want your team mates to have to jump through too many hoops to access your voice notes.
We're working on enabling Google Drive integration so that mote audio content can inherit the access permissions of the 'host' document. Watch this space!