Just checked, they can. Phew. If the forwarding alias was detectable/always used the same schema, that'd also make them borderline useless, just like the `privaterelay` subdomain
What do you mean renamed? Alias address certainly are not changeable. You can randomize next one from 2-3 options, but most of them still follow pattern that is easy to recognize.
PS: I guess its just misunderstsnding and I really meant addresses themself are not human-like enough.
But the private relay domain is only used when you sign up through “Sign in with Apple”? A thing you have to support if your iOS app already supports sign up with other third party authentication providers.
UPD: I obviously mean alias addresses template make most of them too easy to recognize.