Hi Reginald, thanks for reaching out. Yes, I don't have capacity to answer all the questions in the Udemy Q&A because my attention is on Futurise students, but you're welcome to ask your questions here and I'll answer you. Regarding setting a custom GPT on your own domain, ChatGPT doesn't offer this feature, however, I do show you in the chapter titled "Project #8: Building an AI Powered Web App using Bubble and OpenAI APIs" how to build an AI app that you can connect to a custom domain.
In that project we used
https://bubble.io/ however, you can also use
https://momen.app/This way you can build your Custom GPT's functionality and connect it to a custom domain.
I have Bubble and Momen courses here on Futurise too.