A few years back I got permabanned on reddit by an automated message, for no reason I could figure out. A couple of days later I was unbanned (apparently it was part of a mass banning, most of which were erroneous and reversed). So it’s possible this is something similar and you might be reinstated soon.
It’s always good to support the original publisher and encourage local libraries by reading a hard copy, so I could never endorse piracy, even for people who can’t get their hands on a physical copy. Even though it’s true that both libgen and annas-archive have ebook copies of this particular book (and can easily be found via google), I could never in good conscience direct anyone to such a site.