Youtube footage is very often bad quality, using el-cheapo cams and less then optimal technique. Overexposure, lack of shutter electronics and rickety mounts seems to be prevalent, resulting in blown highs, lack of deep blacks, wavy picture etc.. Anyway, footage is just that, footage - i.e. as seen through (often a very bad) camera, while the sim basically emulates what you'd see through your own eyes. Direct capture from a sim will have a greater dynamic range, often better resolution, perfect focus, no anomalies from cheap image sensors and crappy optics and so on. So in sum - yes, sim footage can sometimes look more "real life" than bad footage, obviously apart from the giveaway stuff such as too few and low-poly trackside detail, animations - things like that. Note that this is not a comment on any specific videos, nor saying that sim graphics is perfect, just general observations.