The traffic is getting here via another country who has signed a copyright treaty with the US. Just follow the packets.
The best you can hope for is something like the Great Firewall, which only works on normies.
Seriously?
Anna's Archive hosts ebooks and scholarly journal articles.
Not the kind of stuff your average Instagram Influencer (TM) is into.
I'd be utterly shocked if more than 1% of the population had ever used Anna's Archive. This isn't like Hollywood movie torrenting sites or IPTV sports streaming piracy. It's a long way from mainstream.
If you copy ebooks to a USB and put it at the summit of a tall mountain, for anyone to take, the authorities and "rights"holders will not give a damn. Convenience and scale matters, and that is why Anna's Archive is a target.