You can play Call of Duty: Black Ops 7 for free for a limited time
via polygon.com
Short excerpt below. Read at the original source.
PC players unsure of if they want to dive into Call of Duty: Black Ops 7 can currently dip their toes in for free. Until Dec. 22 at 1 p.m. EST, Black Ops 7‘s multiplayer and Zombies modes will be playable for free via Steam.