“The” asset browser could be any number of sources, some of which are not coupled to any specific engine. AAA games do also use already made shit, especially when it’s an inconsequential background item like a TV. They just don’t use them for the entire game.
That’s funny because the majority of Lemmy.World are people who left Reddit during the 3rd party app-ocolypse. Though I suppose many of them also saw Reddit becoming more and more pro-Nazi as time went on. The loss of the apps was just the kick in the pants needed to actually leave.