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No love lost: AppLovin helpfully releases tool to switch from Unity to Godot or Unreal
(www.pocketgamer.biz)
This is a most excellent place for technology news and articles.
According to https://pitchbook.com/profiles/company/64901-80, there's over 100 investors in Epic, and of course there is Tencent holding a 40% share.
But those investors are not much of an issue either, because you forgot one important point in your list: Epic is swimming in money (and Unreal is just a side business for them).