Unfortunately there is a large middle ground between the "instantly detectable" and the "quality and valuable", between those is the output thats good enough to initially pass as not being AI generated but is still factually wrong (for nonfiction and photos) or lacking in any real substance (for fiction and visual art). Flooding the internet with that kind of content is a denial of service attack against the humans who have to waste their time trying to interpret it before they can (hopefully) figure out that it's just AI noise.