Wasn't there a recent OAI dev day in which they had some users come on stage and discuss how helpful ChatGPT was in parsing diagnoses from different doctors?

I guess the legal risks were large enough to outweigh this

I'd wager it's probably more that there's an identifiable customer and specific product to be sold. Doctors, hospitals, EHR companies and insurers all are very interested in paying for a validated version of this thing.