Cloudflare drafted the Content Signals Policy which complement licenses.

The Content-Signal directive works by signaling your preference of either allowing (yes) or disallowing (no) certain categories of AI actions

It references existing EU law, ie the DSA. It's good to set clear policy and terms of use scrappers can parse. It's new so I suspect most don't honor this yet. But once they get caught, the website could argue this violate term of use.

# 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.

IANAL, consult with a law profesionnal for advice on how to enforce this legally.