Hence, it would be interesting to see how it pans out. Apple will be termed a hypocrite if they let an app violate the policy and stay on the store and they will get brickbats if they remove the app.Apple won’t do that. Everybody will start hating apple. Apple shows their power only to small developers or ban those apps which will stop creating revenue for Apple due to the change like it did with Epic
On the other hand, FB is already suffering with the tracking limits on iOS as nearly 90% have opted out across the world. Further loss of data gathering on iOS would be a huge blow for them.
May be it will force FB to concede or otherwise they could release two different apps and make the old one incompatible which is probably the easiest thing to do.