> There doesn't seem to be a good, evident third option just yet.
I think a good middle ground here is an opt-out approach on Apple's end. Force the user to make a cognitive choice here with a clear understanding of what their choice means. Communication is key.
Some users may very well appreciate and value the hyper-relevant advertisements they see on services, and remain opted-in to the sharing of tracking data.
I personally know many people who have bought many things they value greatly that they discovered through advertisements on various social networks.
At the end of the day, it should be the choice of the user; not the system (Apple/iOS, Google/Android, etc.) or the relying third parties (Facebook, etc.)