With such a stellar job on privacy already, could leaving really be any worse?
http://forums.theregister.co.uk/forum/1/2016/05/06/google_ai_deepmind_nhs/
"Trust us, we're an advertising company masquerading...as a tech company... At the very least Google should be forced to make a statement about what it intends to do with the data it mines.... That can't just be left blank..."