Polkadot offers better scalability than the ethereum blockchain. It offers relay chain, cross-blockchain features, forkless network, decentralized governance and all these are not available in the ethereum network. Actually, Polkadot offers all the solutions to those problems that the ethereum network can not. So many projects are using the Polkadot network. Do you think Polkadot is really Ethreum killer?
I agree that polka dot offers much advanced options and features as compared to ethereum network at the moment but eth developers are also working on longterm developments, features, improvements, upgrades and solutions. So i think ethereum network is always going to have that pioneer advantage.