We are going through a same problem. We have spent about 1 year in developing our multiplayer card game. All the code is written from scratch by our team in unity. For design, we purchased some of the assets pack from unity asset store and we do have the licence to use them. We were very happy with the quality of our game and when we received this weird message (Guideline 4.3 - Design) from the App Store review team, all of us are in shock. So, is our hard work going in vain because we really can't change anything in our game and if we change anything, we will see bugs in our game and it becomes very hard to handle online games. We are feeling very helpless and our team are not able to work since we received this message. Please, if anyone can help us, that will be greatly appreciated. Thanks in advance.

We are going through a same problem. We have spent about 1 year in developing our multiplayer card game. All the code is written from scratch by our team in unity. For design, we purchased some of the assets pack from unity asset store and we do have the licence to use them. We were very happy with the quality of our game and when we received this weird message (Guideline 4.3 - Design) from the App Store review team, all of us are in shock. So, is our hard work going in vain because we really can't change anything in our game and if we change anything, we will see bugs in our game and it becomes very hard to handle online games. We are feeling very helpless and our team are not able to work since we received this message. Please, if anyone can help us, that will be greatly appreciated. Thanks in advance.