Snowden's revelations (2013) were a major watershed. There'd been several measures taken since, based on what I heard on the outside, largely through discussions, mostly public, a few direct, with Google staff via G+.

Starting on, of all days, November 9th, 2016, I began regularly posting an image of Jewish shop windows shattered during Krystallnacht, asking whether Google were thinking of brownshirt-proofing their data. That generated responses including from G+'s architect (then in a role with user data safety & privicy), and the data security lead.

It wasn't until some time later that I realised I'd entirely accidentally picked the anniversary of the event for the post. Though the coincidence was useful.

My understanding was that numerous protections were in place by that time. I continue to have concerns.