Complicated by the fact that those juicy government contracts that Google has contractually obligates them to keep such data. And to make it available to auditors.
I (briefly) consulted for a company that thought those federal contract details were just "boilerplate" and could be ignored. When the feds were done with the audits and started assessing penalties and yanking contracts, the company was shut down as it was suddenly bankrupt. Oops.
(Of course the CEO was a libertarian asshole (but I repeat myself) who didn't think any rules should apply to him.)