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Wouldn't help in this case, the post author banned the bot in the robots for, but then when asked the bot to fetch his web page explicitly by URL...

If a user has a bot directly acting on their behalf (not for training), I think that's fair use... And important to think twice before we block that, since it will be used for accessibility.

IP banning might be limited if they're already using a proxy network, which is par nowadays for avoiding detection.

This actually might work for fucking over certain web vulnerability scanners that will hit robots.txt to perform path/content discovery - have some trap urls that serve up deflate bombs and then ban the IP.