Walled gardens are a huge problem, but they are orthogonal to passkeys. We have had walled gardens for a loooong time already. We should fight them, I agree.

But passkeys are just a way of democratising private keys instead of passwords.

Sure, there will be examples of walled gardens leveraging passkeys. But we have plenty of examples of walled gardens that don't need passkeys at all. It's a different problem.