By now most avid gamers are well aware of the attitudes of game producers towards anyone who dares to create work based on commercial games. Even if there's never any intention to make money from artwork, mods, game conversions, platform migrations, graphics updates, or any of the other millions of ways a game can be celebrated by its biggest fans, the lawyers almost inevitably step in and shut it all down.
But perhaps the worst case scenario for these hard-working and dedicated fans is when they have what appears to be approval from the game producer, only to have that approval pulled after a ton of work has already been completed. That's what happened to the people migrating the 1987 NES game Metal Gear to the Steam platform.
Perhaps the most annoying thing about these ridiculous take-downs is that the work being done by these fans is essentially free promotion for the original game and the company that produced it. The kind of thing big game companies pay other big (advertising) companies to do on a regular basis. Maybe this is part of the copyright mindset, in which if something is 'free' it should be regarded with suspicion. What a waste.