Both the new people which info is in the other comments and the original creator agreed that its ok to make adventures as long as there is a free to download option. He mentioned in a few comments the only monetization allowed is the support one that also has a free option. I would encourage you to still make your content as it's the only way it will expand. Its a good simple system, just not very well known. The people that bought the rights made a card game out of it that I haven't tried but when I contacted them they had no future plans for it.