Depends on the work around. I don't think it is possible to get between app tracking data from some side channel, Apple will definitely block that through legal if not technical enforcement.
But they can use data from Android to infer user behavior for Apple users.
Also, they can still use tracking data from their own properties (IG, FB, Whatsapp).
But they can use data from Android to infer user behavior for Apple users.
Also, they can still use tracking data from their own properties (IG, FB, Whatsapp).