"1. The whole Cambridge Analytica issue was caused by APIs that are too open. For distributed systems there are more ways to exploit the APIs and gather data on

"1. The whole Cambridge Analytica issue was caused by APIs that are too open. For distributed systems there are more ways to exploit the APIs and gather data on users." No, the issue was that other people had access to data they shouldn't have. there's no problem with the API being open if only the right person has access to the right data, ie, if access management is done right