It's great to see that the publicity of the restart of Public Domain additions has fostered new interest in LV.
IMO, the best thing about the restart of the yearly additions of Public Domain (PD) books and other intellectual property, is that one who wants to digitize, record or otherwise use books copyrighted in 1923, no longer has the burden of proof that these book are PD, since their 95 years of copyright protection has expired.
I've seen statistics that say about 85% of the books published in the U.S. between 1923 (now 1924) and 1963 have been in the Public Domain for years, because the copyright holders failed to renew their copyrights for an additional 28-year term, at the appropriate time, as they were required to do in the 1950's, 1960's, etc. However, the burden of proof fell to ebook distributors, producers, and the like to submit and/or retain proof that the copyright regs were not followed and that the books were in the Public Domain, which in many cases is quite onerous and difficult to determine.
Personally, I've successfully submitted a number of projects to Project Gutenberg (PG) for copyright clearance for books published in the mid-1920's and 1930's, with documentation of their PD status, that are now posted at PG.
But it is a huge relief that we no longer need to do detailed research on PD status of 1923 books, and next year, for 1924 books. Whew!
Caveat: I am not a lawyer, and post from my personal experience only.
FWIW,
Don