I knew a guy 20 years ago who was doing a PhD trying to 3D scan caves.

Caving is one of those things where not many people get to go there and any damage is irreversible. Combined with other information, such scanning could provide invaluable information for geology.

But yeah, not in my house. I already used Valetudo to ensure my robot vacuum doesn't send info about my house anywhere. Why the hell would I do a high detail scan and upload it?