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That's true, but Epic is more of a friend to open source than Apple: they donated money to both Blender and Godot Engine. Also Epic benefit from game development being more open in general even if their own engine is not open source. If they gonna win in battle with Apple and will be allowed to have their own store then it's also make it possible to setup more of alternative stores for e.g open source software withou…
That's true, but still a far cry from Valve which has native Linux support for Steam and is actively involved in many open source projects.
Also Valve didnt start to use open source packaging software and haven't even made their own game engine source-available let alone open source. Yes it's nice they improving Linux graphics stack, but they also could do much more.
Like really I dont use Epic Games Store to buy anything neither I support the way they try to capture market share. But any attacks on locked down platforms is a good thing for FOSS.