So, basically iocaine (https://iocaine.madhouse-project.org/). It has indeed been very useful to get the AI scraper load on a server I maintain down to a reasonable level, even with its not so strict default configuration.
A bit like this? ( iocaine is newer)
Any functioning society would deal with the offenders directly and had this stopped before it became an issue for most sites.
Is iocaine actually newer though? Its first commit dates to 2025-01, while the blog post is from 2025-03. I couldn't find info on when Cloudflare started theirs. There's also Nepenthes, which had its first release in 2025-01 too.