private.icloud.com (née privaterelay.appleid.com) is the address for “Sign In With Apple”, which is an oauth-style service that sites opt into to let you use your Apple ID to sign in. Sites offering this as a signup option are already aware it gives users an option to use a private anonymized email address.
The toplevel “Hide My Email” iCloud feature is a different thing, can be done independently of a SIWA flow (you can just go into settings and make more addresses, all it needs is a name and a notes field) and uses @icloud.com in order to make your anonymized email address look indistinguishable from other iCloud users.
The former is “filterable”, yes, but it’s moot because you only get those if you offer Sign In With Apple in the first place, and if you want real emails, you would already know to just… not do that.
The latter is very much not filterable.
The confusing thing though, is that when a user uses Sign In With Apple, they are offered two options: “share my email” which gives the site your real address, and “hide my email” which gives an @private.appleid.com address. But this “hide my email” option is a totally different thing from the separate “hide my email” service, which lets you make arbitrarily many @icloud.com private aliases to forward to your real address. Critically, the latter toplevel Hide My Email feature works with sites that don’t use Sign In With Apple. It’s just stupidly unfortunate that Apple calls both of these features “hide my email.”
Agree with the comment largely; though: Apple does have a policy where apps need to use SIWA if other oauth providers are present (Google) [0]. So sites do "opt in" to this, but are forced by apple to use SIWA if they're using any other provider.
Others have addressed the validity of your comment, but I’d like to discuss another aspect. Even if it is filter, I think most people would not want to filter. Apple makes it very easy to use private relay and many people that buy Apple products do use private relay. Even if you know, it’s a private relay email address, surely you want a user who buys expensive technology products to use your website in almost all circumstances.
private.icloud.com (née privaterelay.appleid.com) is the address for “Sign In With Apple”, which is an oauth-style service that sites opt into to let you use your Apple ID to sign in. Sites offering this as a signup option are already aware it gives users an option to use a private anonymized email address.
The toplevel “Hide My Email” iCloud feature is a different thing, can be done independently of a SIWA flow (you can just go into settings and make more addresses, all it needs is a name and a notes field) and uses @icloud.com in order to make your anonymized email address look indistinguishable from other iCloud users.
The former is “filterable”, yes, but it’s moot because you only get those if you offer Sign In With Apple in the first place, and if you want real emails, you would already know to just… not do that.
The latter is very much not filterable.
The confusing thing though, is that when a user uses Sign In With Apple, they are offered two options: “share my email” which gives the site your real address, and “hide my email” which gives an @private.appleid.com address. But this “hide my email” option is a totally different thing from the separate “hide my email” service, which lets you make arbitrarily many @icloud.com private aliases to forward to your real address. Critically, the latter toplevel Hide My Email feature works with sites that don’t use Sign In With Apple. It’s just stupidly unfortunate that Apple calls both of these features “hide my email.”
Agree with the comment largely; though: Apple does have a policy where apps need to use SIWA if other oauth providers are present (Google) [0]. So sites do "opt in" to this, but are forced by apple to use SIWA if they're using any other provider.
[0]: https://developer.apple.com/app-store/review/guidelines/#sig...
Not arbitrarily many aliases - there's a limit of (as of two or three weeks ago) 768.
I wonder how a single user runs into that.
Others have addressed the validity of your comment, but I’d like to discuss another aspect. Even if it is filter, I think most people would not want to filter. Apple makes it very easy to use private relay and many people that buy Apple products do use private relay. Even if you know, it’s a private relay email address, surely you want a user who buys expensive technology products to use your website in almost all circumstances.
It won't. The news here is that it won't.