You have incremental supply on ETH available to those who deploy mining assets. This broadens ownership through dilution. Solana has had multiple funding rounds and not just one. They can continue to have as many funding rounds as they like.

There will be never be dilution of Solana holders to allow for decentralisation. To earn coins through staking you need to be a preexisting holder.

Running a node doesn't make economic sense and there are plenty of validators which don't charge a commission for delegation. You have no variable costs as an entrenched holder who can just stake coins for more coins till eternity.

All future supply on Solana will only take place through staking unless the backers think otherwise. https://etherscan.io/chart/ethersupplygrowth