The access token issued by Apple will expire in 3600 seconds. The only way to get a new token is redeeming it via refresh token. Then why is there a rule to throttle such calls if requested more than once a day. Absurd!

Original refresh token never expires, agreed. But it can be invalidated by making changes to user profile. After such user actions, Apple will return invalid_grant. So far so good. But why is there a throttle limit of one request per day. Moreover access token issued by Apple expires in 3600 seconds.