They torrented a shitload of books illegally and trained on them.. but they're unable to get past The Great Wall of robots.txt?
plus it's a pretty dangerous game for them to play against large, powerful actors with legions of lawyers
Like book publishers?
If you are on a Mac or Linux computer, odds are it has a program called curl pre-installed. If you type in curl website address in a terminal, it'll fetch make a request and download the response. Robot.txt never gets involved. Same is true for AI agents and search engines that aren't polite.
Regardless - requiring an account to read anything, even a "free" one, totally changes whole situation. Even when sites terms of service are limited by local law.