I have a very negative reaction to sites that require an email to get something of unknown value. Automatic no.
That's an interesting take, given that the landing page demonstrates its value with some example pages, and the index of topics. I can skim the chapter titles and get a pretty good idea of exactly what value there is. I'm not sure what's holding you up.
To me, the reader, what value does sharing my email or it being in The incredibly less flexible "ebook" format have?