LibGen/IPFS is heavily biased toward books from the past ~3 decades, especially books that are cracked EPUB's and PDF's.
IA seems to be much more scans of library books from ~1930-1980, many of which are out of print and probably only available to you via interlibrary loan, which you might wait a month for.
IA is a huge boon for academic research when you need to go back to midcentury books. I don't know which 500K the IA is being required to remove, but I'm very worried.
Even being good for it I can’t stand how most books are like $19.99, knowing I can find it in very good condition on ebay for $6 and get it from the library for free. If they want to sell a lot more books out of the little shops at the airports or wherevers left that books are sold today, make them cheap enough to be a spontaneous purchase again. I have some old paper backs that were like 99 cents new.
Makes you wonder: Do they even have data on their business growth factors? I don't but I'd guess that:
1. nobody is printing downloaded books
2. instead, people like me _buy_ printed books after browsing through them online