If you mean the price of Dogecoin is increasing because of the factors of manipulation made by whales, even top altcoins also have the same way. So, I am not sure to say it is a Ponzi scheme, it is different. I think it is a fact that all people involved in crypto must admit, the whales' power has a big role in the crypto ecosystem. The whales can lead the price to have a pump or a dump in a certain time. They take advantage of this scheme.