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> the majority of their revenue comes from their in-game advertising business

So, they can open still open source it? I mean, open sourcing it would allow competitor to use the same code, but given it is not the same brand and not possible to release to consoles or stores, they could still keep most of their revenue, right?

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They don’t even need to go full FOSS, they can just opt for source-availability to be a bit more competitive with Unreal Engine.

One of the things devs like about Unreal is that the entire codebase is just there to look at, so you can debug any bugs yourself and even add features to the engine that you specifically need for your game. Meanwhile Unity is a black-box blob that you can’t neither debug or extend, and all you can do is yelp in the bug tracker or the forums to get unnoticed.

The C# code is open for read access here: https://github.com/Unity-Technologies/UnityCsReference

It's interesting for some stuff, but it's not the good stuff, mainly just a lot of wrappers for C++ code you really need to know more about.

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