It's entirely possible for Apple or Mozilla (just for example) to run a service checking URLs. In fact they already do this IIRC. They could easily replace all of these redirect links with the real link. Thus every unique link would be visited exactly once. By Apple. Not tracked.

And that's actually stopping it. Even if you don't want to do that, there's real utility in an incremental step where if I go to re-share a Tiktok video I don't accidentally help them track others.