I'm not sure I understand your suspicion that "everyone uses it." The people who dislike AI aren't going to use it. I use GDevelop, they added AI features and I turned it off immediately (by that I mean, clicked the option to hide the "ask AI" button). Now you might find a rare case of someone pretending to hate it but then using it in secret, but that is very unlikely. People who want to use it secretly will usually just not say anything.
There can be reasons not to use "everything available" - those of us who don't want to use it often cite ethical reasons around data scraping and real world resource consumption. Making the best possible game isn't worth it if I'm causing harm to others.