It's to assume that in a company as large as Google it's impossible to know what happens with the data and where its stored and where it gets commingled and whe

It's to assume that in a company as large as Google it's impossible to know what happens with the data and where its stored and where it gets commingled and when maybe even devs are granted access for "debugging". If you give the data away, it's gone, no control. Facebooks issues taught as that.