/g/entoomen library is a stupid joke and an absolute waste of bandwidth.
It's gibabytes of nonsense. Shitload of bad books, pajeet books, webscraps poorly converted to pdf, cropped books, really outdated books, etc.
A shitload of "for dummies" titles too, and for everything else it's VERY incomplete.
It's really not useful, you have to dig through shitloads of non-material to find one interesting book, which you could do much better with a search through libgen.io typing a keyword of your interest.
After I leeched the library I ended up wiping all of it and keepin ONE FUCKING BOOK (MIT lock guide, p gud shit).
I had already my own collection of books which I'd found by myself through websearches on interesting subjects, and my collection was, though not as big, 100 times better, and it had the topics I was interested in and not a shitload of .NET stuff.
My point is that anyone with a little effort can build his own collection just like I did and find the best books, while the /g/entoomen library is just a bunch of garbage and you'll be lucky if you find a handful of books worth keeping after digging through all that clutter.