No, ETH is the token of the original chain which we agreed by social consensus to fork because of an attacker. A public blockchain is a network of people, and the vast majority of the community is in Ethereum. That's what legitimises it.
Another example is BTC vs BCH. BCH is the original bitcoin code, but BTC is the original Bitcoin community.
Another example is BTC vs BCH. BCH is the original bitcoin code, but BTC is the original Bitcoin community.