There are vast quantities of public domain books freely available online, Gutenberg.org, Archive.org, standardebooks.org to name three. The latter in particular

There are vast quantities of public domain books freely available online, Gutenberg.org, Archive.org, standardebooks.org to name three. The latter in particular emphasizes careful production and proper editing, in effect republishing old books in modern editions, but not on paper. I guess I can see how a person might want to promote some old book whose present-day relevance is being overlooked, but the utility of actually printing hardcopy seems minimal.