Here are some relevant links:
https://news.ycombinator.com/item?id=31703394
https://decrypt.co/31906/activists-rally-save-internet-archi...
https://www.courtlistener.com/docket/17211300/hachette-book-...
I guess it got them some goodwill during Corona but it could cause more damage than it's worth.
I wouldn't have done it, it was not like it was a real value during the pandemic. Those who are really into books and don't care about copyright already know their way to more gray-area sites like LibGen.