In China, you can’t exist without a smartphone, because for all existential things you have to do (paying bills, buying tickets etc.) , you are forced to use the almighty wechat app. Smartphones are a tool to manipulate and to spy on the population. It is a tool utilized by the ruling class, to control the masses. I hate the future and I hate “progress”.
That’s only a small part of what the data collection is for.
It is more interesting to consider what happens when people that know what you think start trying to influence how you think.