Epic made more than $5bn in profit from 2018 to 2019, according to documentation from Epic's court case with Apple, and $5.1bn in revenue in 2020.

https://www.theverge.com/2021/5/3/22417447/fortnite-revenue-...

With numbers like that, collecting a half-million dollars from even ten blockbuster games per year is probably not even worth the time and energy it would take; that would be 0.1% of their revenue, which, relatively speaking, is basically nothing. That whole business wouldn't even show up on the balance sheet.