A huge reason for that is the knee-jerk reaction of some communities (gaming especially, for some weird reason) at AI usage. So people build for an audience of one (maybe sharing with their closed friend group), and move on with their lives.
In the US at least, the gaming industry as a mismanaged trash fire. Workers are underpaid and unemployment is high. Executives are regularly shuttering studios responsible for highly acclaimed games and touting AI as the solution to all the problems. Given this framing, the way to support the studio making your favorite games is to make it clear that you don't want to replace everyone with AI. In fact, no AI use at all. It's one extreme in response to another.
From a hobbiest perspective, it's not great either. Translation projects that have been in the works for years have gotten beat to the punch by (extremely shoddy) AI projects helmed by people who don't speak the language they're supposedly translating. In one recent case, a half-completed human translation was stolen, finished with AI, and presented as an original work. Decompilation projects have had similar issues; AI use isn't disclosed until people start discovering that the result isn't accurate to the original.