They save every text you made to every friend and know what games you play, and get telemetry from all games. You don't own any games for real, you rent them so they can data mine. I helped with a team fortress original server called girlpower way way back, we recorded all movements to find data points on every user and how they moved the mouse, we also saved every text they made to collaborate with such data points. At the time I was really young so I thought I would actually get a call from the air force or something bc I used a trackball and was able to flick in the direction and shoot, a high tier gamer, it's much different now and have played professional csgo with regular mouse, much harder imo but I think they track it still. If anyone has a data study on mouse movements I would love to read them. Thanks for your time.