There is an artistic argument here. Movies shot on standard definition digital cameras (early 2000s indies) or TV shows from the CRT era look wrong in 4K. Upscaling adds artificial sharpening and removes the film grain that gave the media its texture. A 480p movie retains the original "soft" aesthetic intended by the director.
Works on almost any digital device, including very old hardware. 480p movie
Modern streaming services (Netflix, Disney+, Amazon) have a dirty secret: their "Low" setting isn't 480p; it's often 320p or 240p. And even then, their 480p stream is heavily compressed to kill grain, resulting in "blocky" artifacts during action scenes. There is an artistic argument here