I've finally understood that people were not expressing concern with AI in your project, but because your profile page and profile pic are AI art. I personally DGAF, as it is minor and can easily be changed for free-to-use human art (you should do it soon, so that people would stop giving you bad karma on your project page). The only thing I fear if that if the project itself were vibe coded, the code would be difficult to maintain in the future because no human would have written nor read it, and nobody can guarantee that AI models aren't capable of putting malware lines in their code.
So, my main concerns about AI are maintaining the code and the security of the code.
I've also seen that there are quite a few other active GBA Studio projects on github. Wouldn't you guys benefit from uniting on that project, instead of all doing your own version of GBA Studio?