Kind of interesting to think about slowly building up and aggregating more layers - e.g. activity, location, shopping, internet, phone, financial, educational,

Kind of interesting to think about slowly building up and aggregating more layers - e.g. activity, location, shopping, internet, phone, financial, educational, medical, legal, work, relationships etc - and interesting how much of this exists already. So if this comprehensive personal dataset becomes the norm at some point in the future - what happens when this is under somebody else's control against your interests (whether an illegal attacker or a legal authority)? And what about more gray areas, such as marketing, insurance etc (which would likely encourage the creation of that kind of API in the first place)?