While Arbitrum is not a cryptocurrency, it has the potential to benefit the Ethereum ecosystem by improving the scalability and speed of transactions, which could lead to wider adoption of Ethereum-based applications and use cases, so ETH is a rising start, not ARB.
Most of people were bridging their ethereum to the arb blockchain. That being said that if people have no interest other than use layer 2 scalable blockchain for ethereum. there are also dapps in arbitrum blockchain. That being said that if ethereum dapps has less users compared with arb ecosystem due to the non sense fees that already faced by the users. I don't even think ethereum is rising star here.,