I fully agree, seems Linux is heading directly towards being a Windows Clone. So far all the windows crap can be easily avoided, but once these things are forced on me, it is bye bye Linux.
Already I use BSD on an older laptop probably 40% of the time. Linux on my main system is there due to a hardware device issue BSD still have a minor problem with it. But for me right now, Linux seems to be heading in a wrong direction.
KeepassXC implements passkeys in a respectful way. I don't see how this is "Windows crap". If they want to force attestation on passkey implementations, whether or not Linux supports it will not matter.
The part that matters is if people adopt the bait. If the bait doesn't get chomped on, the hook is ineffective. Actively encouraging passkey adoption is telling people to eat the bait.