The gaming industry has waged war against reselling games for years. They've been partially successful: most PC games these days come as a Steam code. Any kind of Steam content is DRM protected and cannot be resold. You're also not allowed to play two of the games you own on two computers at once (Steam will immediately log you out). There's family sharing but again your family isn't allowed to play any of your games while you're playing.

On consoles the more expensive physical media is still transferable (BR discs and Switch cardridges). Any kind of digital downloads or DLC addons aren't shareable and you're not allowed to sell them or transfer them.