I'm not really sure you can really put odds down on something like this. For the Youtube things, you are right that Nintendo has had a very unusual track record

I'm not really sure you can really put odds down on something like this. For the Youtube things, you are right that Nintendo has had a very unusual track record with videos. For example, while Let's Plays have been removed, things such as Angry Video Game Nerd and Pat the NES Punk continue to operate without issue. To the best of my knowledge, neither has an agreement with Nintendo, and they utilize Nintendo IP very heavily. Additionally, with something like the Mother 3 translation project, Nintendo was apparently "aware" but took no action. [1] I would assume there were similar conditions for other translation projects for Nintendo products. I think in the case of Mother 3, it helped that it had been officially decided there would be no official translation at the time and the translation team plastered commands about "don't pirate" and links to purchase the original game via import all over the site. This fan game really isn't quite either situation - it uses Nintendo IP, but it's also 100% from the ground up original content and code, so it's just the Metroid IP that Nintendo could issue a cease and desist over. AM2R has been in production for years though, and I don't think it's been any secret to Nintendo. My guess is if they haven't issued a c/d yet, they probably are giving a silent approval. [1] - https://en.wikipedia.org/wiki/Mother_3_fan_translation https://en.wikipedia.org/wiki/Mother_3_fan_translation edit: forgot my link >.<