alt Hacker NewsIt's not in Apples expense, it's actually in it's benefit, your keys would be in their system, and impossible for anyone (including you) to get them out of it.
So you are now locked in to the apple ecosystem forever. You now need Apple to watch Netflix from your Samsung TV.
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You make it sound like Apple needs to lock the door instead of just opening it while everyone else shoots themselves in the foot. For people who want "it just works" as the highest function of their device, nothing comes close to Apple. It's only people with a technical inclination or specific needs who chaff at that, or people like me who are just cranky old bastards who don't want their own media collection apart from i/Apple/Everything.
But man... I cannot tell you how many people don't even notice the walls of the garden. Besides Apple is in competition with some huge players, more than capable of offering "Done with Apple literally trapping you? Follow this link and we'll transfer your passkeys."
Apple has very good support for Passkey storage in third party password managers/wallets. They don't seem to want Passkeys to be a lock in. They've also made it clear that they see attestation as a consumer privacy violation and won't support it.