I think also it's correctness of the information. Google can only infer so much about you. But for you to curate your own data, primed by them, helps them to be

I think also it's correctness of the information. Google can only infer so much about you. But for you to curate your own data, primed by them, helps them to better target relevant information and advertisements to you. It's good and bad I guess. But definitely helps to build trust.