Just seen this on Pcgamer website , am not a cod fan , but best to tell people who would like to give it ago For the rest of this month, however, anyone that's just interested in the Blackout battle royale mode can play for free.
here is the link to the pc gamer page about it
https://www.pcgamer.com/uk/call-of-dutys-blackout-battle-royale-mode-is-free-for-april/
here is the link to the pc gamer page about it
https://www.pcgamer.com/uk/call-of-dutys-blackout-battle-royale-mode-is-free-for-april/