I am not sure what you are talking about but Upwork gives both options (hide my email and show my email) on both web and apps.

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Don't take any requestedScopes i.e authorizationAppleIDRequest.requestedScopes = [] empty array. Don't pass .email or .fullName. In the next steps it you can ask for email like Tinder do. You can later map your Apple user string with email and fetch it back like Tinder does.

Tinder doesn't take any requestedScopes i.e authorizationAppleIDRequest.requestedScopes = [] empty array. Don't pass .email or .fullName. That's why in the next steps it also asks for email. It just maps the account with the user which is a string value received after login. In short Tinder never takes email from Apple Login.

Tinder doesn't take any requestedScopes i.e authorizationAppleIDRequest.requestedScopes = [] empty array. Don't pass .email or .fullName. That's why in the next steps it also asks for email. It just maps the account with the user which is a string value received after login. It doesn't present existing creds. Rather everytime you SIWA, it receives the string user and sends it to the backend to check if any id is mapped with this unique user received. Tinder never takes email from Apple Login