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You can always use a FIDO2.1 key as a passkey, they're not tied to the big tech. I don't even have a smartphone and have been using them on the couple of sites that support passkeys just fine.

We will also have at least one open software implementation when this gets merged:

https://github.com/keepassxreboot/keepassxc/pull/8825

There are braindead implementations like PayPal's:

https://www.paypal.com/us/cshelp/article/what-are-paypal-pas...

that force you to use Android or iOS, but it's nothing new, they manage to fuck up everything they touch (for example, U2F 2FA only supports registering one hardware key and it has been that way for years).