I know almost nothing about Polkadot since this cryptocurrency appeared only recently, but when I first saw that this cryptocurrency is so high in the cryptocurrency market, I was certainly shocked, but so far it is difficult to say what Polkadot is, but I am very familiar with Ripple and therefore I think that Polkadot will soon be out of the top 10 in cmc and therefore Polkadot will not be able to compete with Ripple.