I don’t think this makes sense. Sites already desperately try to get people to log in. I don’t particularly see it as an advantage for Apple if eg the Reddit w

I don’t think this makes sense. Sites already desperately try to get people to log in. I don’t particularly see it as an advantage for Apple if eg the Reddit website or some random online shop makes you log in. If Apple are interested in selling ads, I think they should not want to make it easy to track people on websites through logins as that helps their competitors. I generally model Apple as preferring that you use (and pay for/in) some app rather than a website, and logins are less necessary for apps where you can store information about your session and don’t need to regularly prompt the user for passwords. I think Apple would rather you don’t have some separate account you can log into on a website to eg pay for a service without in-app-purchases. I mostly think of passkeys as a better version of the password manager: allowing users to do what they already want in a more secure way. If there is some subtle business advantage it is maybe that users would make new accounts rather than using sign-in with Google/Facebook, though I don’t know to what extent those features are valuable to Google/Facebook.