Right? Hate when awesome fan projects do this. They know how litigious Nintendo is, release the mod to the public so it's out there before it can get taken down.
As much as I love a good anti-Nintendo circlejerk, mods for older games usually remained untouched. There’s tons and tons of mods for older Mario games that haven’t been acknowledged by Nintendo until this day.
Having said that this mod looks hard af but would love to watch experienced sunshine players beat this.
I had the same thought. There are countless romhacks of games that have lived for years. So long as the game isn't a direct rip of the original that largely plays the same (thinking of that Link's Awakening upgrade that was taken down a few weeks ago), it should survive.
Even then, there are Pokemon improvement hacks that are still surviving. It's probably because the original game is not a part of the download and you patch it over a ROM you supply yourself.