This is the first time I'm reading about that sort of restrictions at Google. What are your sources? Or did/do you work there?

Still, I wouldn't trust that. I can think of enough cases in which algorithms fed with that information would do things not in my interests. (You could easily imagine some internal scoring or profiling a lgorithms taking advantage of the data for example)

Telling "it's only algorithms" doesn't make it secure it I don't know what the algorithms do. (Which of course I can't as it is the core of their busyness)