Nintendo going after ROM sites is possible, they've been doing that for a while, but regular users getting arrested because they've downloaded something from one of these sites is grade A fearmongering.
Nonsense.
Stop misleading people.
Some downloaders are mass reuploaders too.
Don't waste time trying to play Mario Bros 8 bit. You can just watch someone play that on YouTube and get bored.
Play Ghost of Tsushima instead.