LibGen already has plenty of garbage: books that were already garbage when they were written, blurry or truncated scans, OCRed text in the wrong script without the original scans etc. etc.
If someone hacks Google Books and downloads the entire collection, are they going to laboriously filter out the AI garbage? No. Just throw it on the Pile.
The incentive for publishers of AI generated books is that they make money selling them to people.
Social media: Mostly not AI generated
YouTube: Significant part AI generated
Google: Mostly AI generated
Kagi: Significant part AI generated
Anna's Archive: Never seen any AI generated results
LibGen: Never seen any AI generated results
Google Books: Never seen any AI generated results
Google Maps: Never seen any AI generated results
Are there any other huge online resources for finding information that I've missed?
Considering that the amount of information available in a the shadow libraries rivals the general Internet in size, I think it is impressive how they have managed to keep relatively clean.
Why isn't spam a highly effective attack by the copyright agencies?
If you're willing to risk jail time to distribute an AI, you're not going to waste time on capitalist AI
Long live communist AI!
Their roots are from Soviet times, when underground librarians distributed books out of control by the government.