While is not permanently free to own, there are several legitimate ways to play it for free or at a massive discount on PC. Currently, the game is a "paid" title, but it frequently appears in free-to-play events or subscription services. Where to Play or Get Battlefield 4
You can play the full version of Battlefield 4 Premium Edition by subscribing to EA Play , which is also included for members of Xbox Game Pass for PC .
EA occasionally hosts "Game Time" events where you can download and play the full game for a set period (e.g., 168 hours) for free.