They also suggest you add this line to the robots.txt file:

> # ANY RESTRICTIONS EXPRESSED VIA CONTENT SIGNALS ARE EXPRESS RESERVATIONS OF RIGHTS UNDER ARTICLE 4 OF THE EUROPEAN UNION DIRECTIVE 2019/790 ON COPYRIGHT AND RELATED RIGHTS IN THE DIGITAL SINGLE MARKET.

But that legal restriction only applies to Europeans, so this only prevents European AI companies from developing models on par with American and Chinese AI. Correct me if I'm wrong.

Also open-source AI models like Llama and DeepSeek will be trained on all websites and released for free anyway, and those models can be used by Europeans, so in practice this policy won't really keep your website out of AI use anyway.

Ultimately it's just serving to prevent Europeans from developing equally good AI models and AI search apps.