I wonder if DRM is useful for this. The problem: I want people to access my site, but not Google, not bots, not crawlers and certainly not for use by AI.

I don't really know anything about DRM except it is used to take down sites that violate it. Perhaps it is possible for cloudflare (or anyone else) to file a take down notice with Perplexity. That might at least confuse them.

Corporations use this to protect their content. I should be able to protect mine as well. What's good for the goose.