Just remember how many AAA or big name titles use Unreal as engine. Those can sell millions of copies at 60 per copy. And even if they have much better rate it is still probably half a million to millions a game.
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.
I don't think that's in the right ballpark. PUBG has generated about $15 billion in revenue over 6 years or $125 million per year in revenue for Epic.
Jedi: Fallen Order sold 10 million copies at full price in its first four months, netting Epic ~$20 million.
Even an indie game like Stray netted Epic ~$2 million in one month of Steam sales.
https://vgsales.fandom.com/wiki/PUBG
https://en.wikipedia.org/wiki/Star_Wars_Jedi:_Fallen_Order#S...
https://www.gamesensor.info/news/stray
* assuming all these devs have the standard 5% deal and chopping 30% off for marketplace fees where only sales*price data was available
I can't imagine it being chump change.