Mahadeva is a private, single-user personal assistant built and operated by Suraj Menon for his own use. It runs on a server he controls and connects to Google accounts that he personally owns (Gmail, Calendar, Drive and Docs) so that he can ask it to read his mail, check his calendar and draft or send messages on his behalf.
Mahadeva is not a product. It is not offered to the public. Its only user is its operator, and the only Google accounts it is ever connected to are accounts the operator owns himself.
Every action that changes anything (sending an email, creating an event, editing a file) is confirmed by the operator before it happens. Reads are performed only when the operator asks a question that needs them. Nothing is shared with third parties. See the privacy policy.