I have to think people aren't doing any research. Both Android and Apple sync your passkeys to your account. You can toss all your devices in a wood chipper, buy a replacement and still have access to all your passkeys.
Remember that your average user has no idea what a passkey is, doesn't remember half of their passwords and has no idea what a password manager is.
I actually do have a Google account, but do not link my (Android) phone to it. I don't have WhatsApp or any other spyware on the device. I do use Telegram, Ankidroid, and a few other apps that I trust. I'm not a fanatic, but I won't enable and abet anybody to follow me around and report all that I do. How my position is considered an extreme position today eludes me, and frightens me as well.