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UE4 isn’t open source. You get source access with the license but it’s quite restrictive on what you can actually do with it. If you tried to setup a competing engine based on a fork of it you would quickly find yourself being sued.

Godot would be an example of an open source game engine.

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As you can see what happened to Silicon Knights.

https://www.engadget.com/amp/2012/11/09/silicon-knights-v-ep...

Thanks for the clarification. I believe UE4 is still a good example of how the PR-bias towards anything 'open-source'. All it took was a few headlines with "Unreal" and "open-source" and I naturally grouped it with the likes of Blender and Godot.

Right but all that means is that Epic were able to exploit a lack of understanding. Not really that noble or exceptional. There is a PR bias towards open source because it’s seen as a selfless act to provide free software. Conflating that with commercial software such as UE4 actually takes away from that since it dupes the unwary.

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