Over the years, we’ve seen a lot of stories about fan works and videos taken down by Nintendo. There were the cases of AM2R and Pokemon Uranium, which caused a ton of controversy a few years back. There was the Patreon for Super Mario Bros Z and the 101 character Mario Kart video, which showed […] Source
Can we have a link to the adult content? You know, for research
But what happen here is that she used Nintendo images, associated it with adult content and then advertised it to the world. Once Nintendo released the lawyer dogs, everything releated including her username was up for hunting.
Overall no one small doesn't have to worry about being sued over thier username.