Under ATT, can Unity use 1st party data for Game-to-Game attribution?

Question

If Game A is showing an ad for Game B -> and both are made with Unity, I'm guessing Unity would have its own unique ID on each instance of the game.

Can Unity use that data for attribution? Seems like Apple would be cut out of that loop. While this may be against the spirit of ATT, I can't see what Apple can do about it...they can't ban all games.

Answer 1

My understanding is: No, Unity has no unique, proprietary access to user data from within an app just because that app was built with the Unity3D engine.