So what's the moat for all the startups that are wrappers around ChatGPT?

cma.xyz. Founder /paragraph, ceo /mirror, previously at Google & Coinbase 

Customer relationship and experience, probably. A good moat but requires skill to maintain.

Probably similar to other SaaS: lock in, data network effects (results get better more people train) and brand.

Maybe system design for some?

Specific example being existing architecture that is made better by GPT. For instance, legal tech infra that already uses entity recognition and text extraction to parse thousands of pages of some dense docs.

If it returns structured data, next step could be a summary of what it did.