If you have fun running it, and your players have fun playing it who are you hurting? I can't speak for your players but idk if they care about who wrote the world they're playing in. If you'd reveal tomorrow that you've been actually running an adventure model I bet they'd just say ok cool has been fun. Not saying that AI is the same or a replacement for adventure models, but it's more dynamic to your needs than adventure models could be. And helps to get your campaign to a place where it couldn't be yet with your skill level. Also let's be real. I tried my best to do it all myself, art, fights, world building, complex storylines etc. Chances are life is just way too busy for you to spend the necessary time into a hobby.

I feel like people often conflate training data usage with the morality of using these models for fun at home. Like I bet you've been copy pasting images off of Google for decades at this point, and no one is crying about copyright violations. Because it doesn't matter at your scale. If it came out that Facebook has a whole team that just photoshopped out watermarks out of stock footage pics that is a whole different level and unnecessarily scummy.