[reginald78]

> This is only partially true. Nothing in the spec, all up to implementers. At least KeypassXC sure provides a way to access your data: https://github.com/keepassxreboot/keepassxc/issues/10407. Other software behavior may vary.

This thread is one of the guys from FIDO threatening to blacklist keypass for doing just that, using the spec'd passkey attestation feature as the tool to do so. Just because the attestation feature isn't widely used as a weapon just this second doesn't mean that is not the intended endgame, in fact I'd argue the hand was tipped in that very thread.