In the flip side, someone who blocks private.iCloud.com will block the ability to do SSO with Apple, thereby cutting themselves off from Apple’s ecosystem.
Not really. You could allow private.icloud.com only if they're using Apple's SSO. If someone tries to create an account not using Apple's SSO, then you don't allow private.icloud.com email addresses.
Not really. You could allow private.icloud.com only if they're using Apple's SSO. If someone tries to create an account not using Apple's SSO, then you don't allow private.icloud.com email addresses.