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 don't think Polkadot is Ethereum killer, maybe this was just your own perception only dude,
and as I can see with Polkadot is not design for that thing where it made to destroy ETH, of course not!
Although, Polkadot has a potentials like Ethereum but instead of, thinking it is the killer why not think of the better
for the holders of DOT and ETH as well.