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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.
Pretty sure Godot has it's own scripting language (hence the prompt converting all the C#/JS code from Unity).
Unreal is C++ but it's also another commercial proprietary engine, so they could rug-pull in the same way.
Godot supports C# as well as its native python-like GDscript.