デベロッパ向けのすべての法的利用規約も含む、Apple Adsサービス規約の全文はこちらでご確認いただけます。

https://ads.apple.com/jp/terms-of-service

and password into a secure, Apple-hosted 
 web page to identify themselves and complete the sign-in. Otherwise, the experience is the same. Sign in with App...

https://www.apple.com/jp/privacy/docs/Sign_in_with_Apple_White_Paper_Nov_2019.pdf