EU court rules no EULA can forbid decompilation, if you want to fix a bug
People are definitely gonna use this ruling to justify reverse engineering games to modify the game design, claiming that the balancing/mechanics are "buggy". Some of that will be in earnest, some of it will be cover for pirates. The stuff that will be in earnest will make for some interesting arguments about who really owns a game design once it's out in the world, and what constitutes a bug vs a design choice/flaw