I don't quite get the behavioural analysis bits. I spend time on my phone reading the news, reddit, HN, a couple blogs, WhatsApp with friends and I also play ga

I don't quite get the behavioural analysis bits. I spend time on my phone reading the news, reddit, HN, a couple blogs, WhatsApp with friends and I also play games here and there until they bore me. The game I logged the most time in is a port of a game made by a shareware-style developer back in the ninetees. Where was such analysis involved in driving my usage patterns?