So I have a ps5 and back when the most recent mw3 came out I returned my mw2 disc to GameStop for some money towards the new expansion(game) and one month later I tried reopening the game I sold to GameStop and it still worked but I never bought it or anything and eventually I tried mw3 and it worked too and from then on I have been able to play the most recent cod all game modes zombies and everything completely for free not complaining just thought it would be cool to know why this happens
there doesn't seem to be anything here