BTC and ETH are undoubtedly the most decentralized, crash free, and secure. But Polkadot @ Polkadot may not have the same level of economic security as these two, but decentralized technology is definitely resistant to attacks. Previously, Polkadot and Avax were popular and resistant to attacks, but Avax also had a high gas problem at the time. Although the adoption was not as expected before, you can say that it was not successful, but you cannot say that it was a technical dish.