iCloud Passwords is not built-in to Windows, so users have to know to install it. Most don't. Most iPhone users don't know they're using iCloud Passwords. In fact, many aren't (because it is oftentimes toggled off in settings because their grandson told them to do it or some other b.s. like that).
And, also, it barely works, if the wind is blowing in the right direction; was clearly built by a long forgotten team to check a box.
They've also released a Chrome extension, but no Firefox extension (actually, they did release a Firefox extension, but it only works on MacOS). Again, you have to know to install this.
The Windows Hello bluetooth system for passkeys has never worked for anyone I've seen try to use it. The display & scanning of the QR code works better. But, that only works if the passkey was generated on iOS and is being used on Windows; if the passkey was generated on Windows and needs to be used on iOS, you're probably screwed (I've never seen Windows try to pop open its webcam, if the device even has a webcam, to scan a QR code on another device.)
And, also, it barely works, if the wind is blowing in the right direction; was clearly built by a long forgotten team to check a box.
They've also released a Chrome extension, but no Firefox extension (actually, they did release a Firefox extension, but it only works on MacOS). Again, you have to know to install this.
The Windows Hello bluetooth system for passkeys has never worked for anyone I've seen try to use it. The display & scanning of the QR code works better. But, that only works if the passkey was generated on iOS and is being used on Windows; if the passkey was generated on Windows and needs to be used on iOS, you're probably screwed (I've never seen Windows try to pop open its webcam, if the device even has a webcam, to scan a QR code on another device.)