What valuable professional data is completely locked away from AI companies? [D]

Hi all,

Apologies beforehand if this is the wrong subreddit, let me know if you think there are better subreddits for this post.

I’m working on a project around proprietary data licensing for AI training and trying to identify data types that are genuinely inaccessible to AI labs- not because it doesn’t exist, but because no one has figured out how to unlock it.

Specifically looking for data that is:

• Created by domain experts as part of their daily work • Never published or shared outside the organization • Rich in human reasoning, not just structured outputs 

Finance is my background so I’m especially curious about examples there, but all industries welcome.

What’s the most valuable “locked” professional data you’ve come across in your field - and who (if ya know) owns the rights to it?