I presume your definition of use case is something that doesn't include what people normally use it for. And I presume me using it for coding every day is disqualified as well.

I didn't mean to suggest it has no utility at all. That's obviously wrong (same for crypto). I meant a use case in line with the projections the companies have claimed (multiple trillions). Help with basic coding (of which efficiency gains are still speculative) is not a multi-trillion dollar business.