Assassin’s Creed, FIFA, Call of Duty? Not big enough. Still have to deal with Steam.
They don't have to. OK, maybe Microsoft has to because they are the actual monopolist and making the Activision Blizzard franchises available on storefronts other than Microsoft's own is to keep the watchdogs away.
Also, none of the franchises are exclusive to Steam, so Steam has no monopoly.
It takes being significantly bigger than the entire Epic store to even consider not doing Steam on PC.
That sentence makes no sense. Fortnite is exclusive to EGS, therefore it cannot be "significantly bigger than the entire Epic store".
Steam has no policies that forbid offering games on other stores, Epic has policies that makes certain games timed exclusives to EGS.
What makes EGS unattractive compared to Steam is the simple fact that Epic chooses to most prominently display their own games on EGS. Valve does front page banners, fests, that window that opens with every Steam launch, etc. and goes out of their way to make everything from big launches as well as solo dev indie games discoverable.
Epic has it in their own hands to make EGS more than the Fortnite launcher. They could promote other EGS games inside Fortnite but they don't. They host concerts inside Fortnite but nothing to promote 3rd party EGS games, for examle.
That’s a bad look for competition on the PC market. There aren’t that many Fortnites or Minecrafts coming in the future. Gaming investment is drying up and gaming is becoming a cash business, rather than an investment business. And the cash flows to Valve.
USD 45 billion overall PC gaming revenue and all of Steam combined is 8.6bn. "And the cash flows to Valve"? Sure...