At the Treyarch Black Ops 4 Reveal earlier alot of the expected rumours ie, no campaing, battle royale, zombies etc was revealed but a major surprise was that it will be exclusive to Blizzards Battle.net and it wont be getting a steam release at all.
This is a companion discussion topic for the original entry at https://ink.mostepic.win/black-ops-4-will-not-be-released-on-steam-but-on-blizzards-battle-net/