Hmmm...on one hand, I want to jump up and down and squeal with you like a little girl. On the other hand, as the author of a lot of books, I am pretty sure that pdfdrive is involved in the pirating of books so that authors do not get paid for their work. It's hard enough to make a buck as a writer without people stealing or illegally sharing the books you've written just because it can be done (yay, digital books. Or maybe not).
So if this is true of pdfdrive, I wouldn't be jumping up and down and squealing with you like a little girl.
I'm pretty certain this is true about pdfdrive - but if I'm wrong, I'll squeal with you. :)