The only actual Epic Game Store exclusive is Fortnite on PC.
"Fortnite gets a boost from Season 9 but is still far off from its peak. Fortnite made $203 million across console, PC and mobile, up significantly from April but down 38% from May 2018. Console continues to contribute the largest share of players and revenue."
So that fad is coming to an inevitable end and with it Epic's ability to lock down exclusives. They should be focusing all the Fortnite cash on making their platform as good as if not better than Steam.
"What is the most resilient parasite? Bacteria? A virus? An intestinal worm? An idea. Resilient... highly contagious. Once an idea has taken hold of the brain it is almost impossible to eradicate."