Actually OP is right. Those nft associated with crypto project are not all into use case but just riding the hype. Only few projects are somehow exhibit the potential of nfts. We can say that there are rare created digital nfts but actually can't find any use at all, but appreciation only from those who are fond of having collections, there are people out there spend a lot for this and for them it's rare quantity plus design is already soemthing valuable.