Comment by Tozen

There isn't, and of course they will not spell it out. Read Google's policies (https://policies.google.com/privacy?hl=en-US). Google makes it very clear they collect a tremendous amount of data when the account is active, and reserves the right to retain data as necessary for business or legal purposes, security, fraud and abuse prevention, or financial record-keeping.

It's data on their servers that they control, that no longer has a user. The data then can fall into any of the categories mentioned above, to include the possibility of transfer to 3rd party entities. That they may eventually delete it, is different from how they may have used it or to what entities they may have sent portions to.