@Emi Eh, even if all Unity developers move to Unreal Engine, UE wouldn't have anything near a monopoly. Many big studios use in-house proprietary engines, many indie games are coming out with other engines, if any. I think it's rather close-minded to think that UE will get a monopoly state just because Unity, one of many other options, decides to fuck everyone over. Still, if you're a developer you should learn as many engines as possible. You won't get anywhere if you're not versatile.

@foone https://cdecl.org/ is a self-described "C gibberish to English" translator