Interesting — an aside, I did not realize just how many protocols are supported on Coinbase Earn, otherwise I would have simply gone through each to see — but probably moot if these "third party service providers" are just doing the busywork of interacting with the protocol, on behalf of Coinbase, on behalf of the user. I grant that this involves a kind of custody management you don't see in other non-securitized IT services, but as long as everything is spelled out clearly (which it seems to be in the excerpt you posted) I maintain my position.
>What? Do a good job, make money. Do a bad job lose money.
This is more accurately phrased as "Do nothing out of the ordinary, make money. Do a bad job lose money." Nobody can "stake better" and expect more rewards out of it.