Yes, the right tool for the job, but because TS covers a set of tools its rare that this is exactly the tool you need. I'm sure there are cases but mostly I think people just use it because of the hype/preference and I really hate to make prototypes with TS.
Yeah, prototypes are probably the wrong use case for React or TypeScript because they can crash without causing someone $X million in revenue (by definition; if it can cost someone $X million in revenue, it's no longer a prototype and the team maintaining it probably wants stronger guarantees than what native JavaScript provides for proper use of APIs and data handling if they ever want to sleep at night).
