It's not. It's a problem for all of us. High quality books are an asset for society, and we all should be interested in finding a solution. Not necessarily by enforcing unenforceable rules from previous centuries. But we need something else that works.
A society in which only those with too much time on their hands write books is an intellectually poor one. We need authors who spend full time on producing high quality books, be it on non-fictional educational topic or on fictional entertainment. No worlds-best-expert is going to sit down and spend years of their life compiling a well-written book on a subject, just as little as Tom Cruise is going to shoot the next Top Gun for free (and the rest of the production company as well). We need to find a way, otherwise education will be stuck with outdated material and 5min ad-ridden clips on youtube by non-experts. (No offense, there are lots of experts on youtube, but there is a lot of crap out there too, and a 5 min clip on quantum entanglement just can't compete with a proper book. Whoever disagrees with this has likely watched too many such clips and never consumed a good book.)