I have spent more hours than I can quantify opens sourcing books at Distributed Proofreaders and Distributed Proofreaders Canada. And I strongly believe copyright got out out of control and should not have such a long time.
I also strongly believe that getting access to scientific papers, many prepared with tax dollars is necessary.
But this - NO. An author wrote it and it should be bought or borrowed. I have in past bought books I liked, read and given to the Winnipeg Library. US, they have interlibrary loans, free, at least they did. I can get some books free via my tiny Iowa library onto my kobo. Explore your options.
It looks like a lovely book. If you feel I am wrong in my beliefs on this particular book, well I suggest binding arbitration, with the author.
I feel no guilt with several hundred scientific articles via "the hub". But for that book at this time, no.