Games

Yeaaah, but then again not really, there has been an Unreal scene in indies. I'd say it was a 60-30-10 split between Unity, Unreal and Godot (of people using these engines, not counting custom ones). My point is there is a "character" or "personality" of these engines. It stems from both the factors you mentioned, and the tutorials / sample projects that are in Unreal or Unity. Unreal games quite often have specific lighting that immediately makes you go "Unreal" from looking at a game. I can't really explain it, it's like seeing AI photos - sometimes all the fingers, eyes are there but the "uncanny valley" feeling remains. For Unity it always was the "jank" to me, even without seeing any logo and googling afterwards. Probably just confirmation bias on my part, but oh well

Edit: for Unreal another tell is the default "skeleton" animations for a third person character. Some of the cheap asset flips even leave the unreal robot / doll model. It mostly stems from the UE marketplace and people rigging their models with the default skeleton so more anims / custom ones work for it