alt Hacker News> at login time it's not possible to retroactively require attestation if it wasn't obtained during registration.
Of course it is, the site will reject the passkey and require you to create one that is attested.
> Are Netflix and Twitter currently requesting attestation when people register passkeys, and rejecting the registration if the user declines the permission prompt?
They could start tomorrow.
> a hypothetical and unlikely scenario.
You have not been paying attention, that scenario is where this whole thing is building towards.
> If consumer-facing sites start requesting attestation when registering passkeys, they deserve to be vigorously called out
It's going to be the banks first.
Why called out, it's all for your safety, to make sure you are not using an insecure client that might leak your data.
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Any site/service could easily implement their own proprietary solution to force compliance around usage of said service. Whether they can abuse Passkeys or not is irrelevant. If the service does something inappropriate, you can stop using it and, if necessary, build a competing service that is not abusive.
To suggest that people should stop using Passkeys over this is throwing the baby out with the bathwater. All of these features of Passkeys are appropriate in a given context. The only concern is where a service that might not need/justify "high security" Passkeys starts demanding them anyway, and no-one is forcing you to use said service in that case.
Banks want attested terminals and for the customer to pay for them. An even better deal for the bank than ATMs, kind of like of how cable TV boxes enforce DRM on the customer and are paid for by the customer.