Easily is the operative word. Blockbuster was easy but you had to drive there -- netflix is easier. Libraries similarly require driving (unless you use overdrive / similar) but piracy is easier for many as well. Books just haven't found their spotify/netflix; the kindle store is basically 2009 itunes.
I don't think many realize how much libraries have via internet ("overdrive / similar") these days. You don't even have to show up in person to sign up at my local library.
Libgen and the like tend to just have more on hand though, and that's the big differentiator in usability IMO. There are things your local library just isn't going to have a copy of but libgen will. After that happens once, why bother with the library again? Outside of "it's legal" or "I find more moral" type concepts there tends not to be a strong reason.
