Thanks for replying! This is concerning if true. Is this documented or proven anywhere? I had heard something similar, but can't seem to find any reliable source that confirms the messages are in plaintext.
WhatsApp recently announced that users will soon be able to backup all of their data to Google Drive without that storage eating into their allocated Drive storage. What the company ommitted to say at the time was that the data backed-up to Drive will be stored in plaintext, without any encryption.