They probably had no idea Yahtzee and co were that loyal to Nick. That said, I’m shocked Yahtzee was never given an ownership stake, as an insurance against… Well, this exact scenario.
You need to learn to teach games you own. Rules vids don’t work for me even 10% as well as a decent teach at the table. You have to be prepared, as even a midweight game like Cosmic Encounter takes 15 mins of monologuing. SU&SD have a good vid on how to do it well.