I've never used Coinbase myself, but last I read about them they were offering users the ability to back up their private keys to Google or Apple's cloud storage. I don't understand how anyone who has been involved in crypto for more than a week would want to use that and not understand how awful an idea it is.
It is strange they offer that option, and it is laughable. I've used Coinbase to convert fiat into bitcoin, but that's about it. If I do store anything on their platform it's for a couple of days max, so they can do what ever they want with my "private" keys.
Wasn't Ledger supposed to implement something similar in a software update? I might have confused it with Trezor.
I know blockchain.com has a specific Ledger built HW wallet that can be used in conjunction with their web wallet. That's a brilliant idea, more web wallet services should offer such an option.