Why are they charging for access to ebooks, many of which are already in the public domain and available at archive.org[1]? [1] https://archive.org/search.php?

Why are they charging for access to ebooks, many of which are already in the public domain and available at archive.org[1]? [1] https://archive.org/search.php?query=loeb%20classical%20library%20AND%20mediatype%3Atexts https://archive.org/search.php?query=loeb%20classical%20libr...