Google removed a ridiculous amount of material during the dispute with the Author's Guild. I know because a bunch of my legal history research citation links collected between 2007-2011 are long since dead, with the material completely gone, AFAICT, and either not discoverable or only available in excerpt. And this was stuff from the 19th and early 20th centuries, which definitely was out of copyright in the US, though some of it may have potentially been a headache in Europe regarding copyright-adjacent author rights that Google didn't want to deal with.