Hello Chris, good day! You bring a great point as I've never considered the possibility of our assets being used in NFTs. Upon deliberation however, we've come to the conclusion that we won't extend the usage of these packs to NFTs.
You're allowed to use the assets to create games, novels, animations and other pieces of educational or entertainment media for free or commercial use, with no attribution required. Redistributing or commercializing the assets directly, or anything fashioned from them such as plushies or NFTs, is generally* not permitted. Thank you for your understanding,
-Jo
*you need to ask for additional permission for such uses. NFTs are, due to many different points but in particular to allow every customer to have equal usage rights, unlikely to be something ever permitted, however.