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Epic Games Store is offering developers 100% of revenue for six months of exclusivity
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I don't know that I'd take a moral stand against epic and for unity https://www.gamedeveloper.com/culture/why-is-unity-s-merger-with-ironsource-angering-developers
Don't forget https://www.crytek.com/ is still around too and still making CryEngine (there were some bad years where they were struggling to pay people, but they seem to be in a good place again). Lots of work going on behind the scenes to improve this engine for Crysis 4 and Hunt Showdown from what I understand.
There's also the (heavily modified at this point) cryengine derived https://o3de.org/.