I don't think ChatGPT could handle writing mission codes or dynamically rewriting mission scripts for a campaign. It's good, but not that good.
Sure, it's not flawless and may occasionally throw unexpected responses, but overall, it's incredibly helpful in finding solutions to problems, especially when you need some guidance. I use ChatGPT for my airplane blog, where it helps me brainstorm ideas, draft posts, and polish my writing.
In addition to ChatGPT, I also use Word Hero for the content of my blog. It assists in generating engaging copy, saving time and effort. And I pay $49 per month for it. It may sound much, but my content is polished and resonates with my audience. Some AI writing tools cost $9-$12, but they don't do the job as good as the more expensive ones. There's a list of them on https://writingtools.co.uk/pricing.html that shows their features and prices.