I should've really said the most decentralized alternative option but even in terms of biggest holders ETH is more top heavy (many controlled by the same people as you said).
> but there's a much easier barrier to entry for new validators.
Is it? The minimum to run a validator is 32 ETH[0] while there isn't even a minimum for ADA. 4 GB of RAM and 1 GB bandwidth[1] (for ADA) isn't much of a deterrent either.
0. https://ethereum.org/en/eth2/staking
1. https://forum.cardano.org/t/a-guide-to-becoming-a-stake-pool...