With ethereum the staking mechanism is a bit more complex, my understanding is you lock your stake for quite a while so maybe its too risky for the exchanges, but wouldn't be surprised that exchanges will market a 'stake your eth' feature.
Once withdraws are enabled this landscape may change. There is a lot more work that needs to be done to improve decentralized staking pools, if they continue to expand they can consume large percentage of the total staked Eth with less concern than centralized staking services like Coinbase.
One of the big problems with Tezos is that the governance is tied to the stake. This means in practice most users will not have much of a say in governance because the largest stakers will consume most of the votes. The only thing that has stopped this so far is that large CEX stakers are voting Pass, but this act of goodwill may not always be the case in the future.
If your home RasPi validator drops you don't lose much. If 25% of users stake on coinbase and _they_ go down the penalties are much higher.
So there's an incentive to validate on your own hardware/connection.
It remains to be seen how much further staking will centralize. So far the distribution isn't so bad: https://i.redd.it/5lhlmwdg27j91.png