They are a "publicy traded" company (like Tesla) because their shares are available on the stock market for non-qualified investors, and not "privately held" (like SpaceX).
Why would you be allowed to have unrecorded conversations in the office? Doesn’t that show the same intent?
Is the default to record all chat conversations? Yes.
Then Google enacted a policy to have employees turn off the recording of chat conversations if they were going to discuss certain topics.
If you delete chat, that is destroying written records.
Are all written records supposed to be preserved when you're in litigation, or just relevant records?
Disclosure issues, and destruction of records, are prominent issues in two UK scandals just now: the Contaminated Blookd Scandal, and the Post Office Horizon scandal.
That's one of the arguments Google tried. Good luck.