They earn a lot from Fortnite sure. Unreal engine is not technically open source, I’m aware that their revenue from it is that significant compared to Fortnite

They earn a lot from Fortnite sure. Unreal engine is not technically open source, I’m aware that their revenue from it is that significant compared to Fortnite and they make money by taking a share of revenue from it’s users. Not sure how all of that is relevant for open source though . IBM/Red Hat, Google or even Oracle would be much better examples