Cryptos generally don't have a real use case, they have a theoretical use case. Their developers promise clueless investors that their coin will be actively used by people for something, but such promises never materialize. Unexperienced investors think that it's okay to invest in a product that no one uses, because users will come with time, they just don't think that users can never come at all.
There's no better way or better solution to this topic, than this lighting message here, it is true that crypto currency in general do not have a use case, it's just a case of tell it all, Accept or leave it. Without a proof authenticity of it