If such statements were true on the matter then we'd never see Bitcoin or any other Altcoin come as far as they have nor would see people make any sort of profit from it, which they are already and not be able to use cryptocurrency for some everyday uses which we see in a lot of countries now which accept it as payment for services and other things. If people believed that this was a ponzi scheme it would've never come as far as it did nor would we see people who invested in Bitcoin when it wasn't worth anything hardly to be rich now. As we're moving towards the digital age with each passing day people become more aware of the importance of cryptocurrency.
Not
uses of cryptocurrency but
transfers of cryptocurrency. Transfers from one address to another. Nearly everything that is in existence has the capacity to be transferred from one address to another, either electronically or manually. However, that does not mean that everything has the capacitly to be used, consumed or practically utilized for satisfying human needs. And it is the capacitly to satisfy human needs why things are produced and why they came to the market in the first place. For e.g. there are lots of people who have needs to consume goods or services they don't own. But how can they get them? Well, by borrowing them, with the implied or expressed intention of returning the same or an equivalent good or service in the future. And here is where the bank kicks in with its product - dollar. Dollar is produced to satisfy needs of these people. This product is composed of two crucial parts: contract and collateral. These two components guarantee that those who traded produced dollars to people for their goods and services, return goods and services back to people, which happens every time their contract obligates them to make loan payments. Hence, dollar is a product like food or clothing, with the capacity to be used, consumed or practically utilized by its end users (borrowers). Bitcoin on the other hand has no such capacity, which is why it can only be passed from address-to-address, from hand-to-hand, from member-to-member. And this is exactly how classical fraudulent schemes operate.