Coinbase's recent staking-as-a-service announcement is an answer to Proof-of-Stake (PoS) token holders desire for inflation offsetting rewards, particularly for those who who cannot stake on their own. Stakers can anticipate rewards of 5-8% per year which is not interest, but an inflation reward with governance rights attached. Governance rights mostly amount to network votes, like the recent Tezos' ($XTZ) Athens protocol vote. The verdict on PoS is still out, as the benefits of stability and speed weigh against security and decentralization.