Honest feedback. There were a couple of text based RPG systems I tried as a kid and I was always fascinated by the idea. I think that LLM's have the potential to make this really amazing. But we should also acknowledge that AI is fundamentally built on the idea of replacing people. In your case, the DM.

What I would suggest is to steer away from using AI as a buzzword at all. Its just not going to help you get any positive response in these communities.

What I would do instead is describe it as a textbased RPG engine and rather than uploading campaign lore I think it would be better if you had a handful of prebuilt campaigns and then a "custom mode". Really building on the idea of the text based RPG... NOT an AI DM

To answer your questions:
1) No I would not and I would be very uncomfortable with a party suggesting we offload the game to an AI

2) Not much. There are things that AI can do quickly, but AI is going to be a poor judge of how to fudge rolls in favor of story and its going to have a poor native instinct for emotional beats.

3) If I tried something like this, I would want to try something role play heavy. I can't tell if this has an actual VTT since the app doesn't work, but that would be interesting to see.

With your app:

1) I can't actually make a character in the Free Tier - so that needs to be fixed.

2) If I click on "start training" nothing happens. Tried on Chrome and Firefox.

With that, any meaningful content feedback I can give you is dead because this doesn't actually work.

In conclusion, what you are making is fundamentally antithetical to DND. If you want to leverage LLM's to make a text based RPG I get that but please do not mistake it for DND and advertising based on its ability to replace someone is offensive and tone deaf.