Here's a new setting to "Prevent third-party sharing for" your WordPress.com blog.
Underneath, it says, "This option will prevent this site’s content from being shared with our licensed network of content and research partners, including those that train AI models."
Have a look at it here:
https://wordpress.com/settings/general
Here's the announcement post about all this:
https://wordpress.com/blog/2024/02/27/more-control-over-the-content-you-share/
I work for Automattic. I'm not involved with this part of the business, however.