Government actors are not really interested in what you write (probably because it would be too much information to handle), but they are very interested in whe

Government actors are not really interested in what you write (probably because it would be too much information to handle), but they are very interested in where you are located and who you interact with, in order to create a ("terrorist") network graph. And according to the article that is what Matrix collects (the company behind Matrix - allegedly Israel’s Intelligence according to the article)