If the cost of using the software is giving up clear title to your work, then it's a very high cost indeed. A deal that big needs to be advertised - boldly - up front, not buried in the ELUA, then popping up after you've committed time and effort to a work.
I can understand them saying that wanting to use the Apple store means giving them the same 30% cut that they charge for in-app subscriptions, and demanding that you adjust your prices on all other platforms to remain competitive. That's hardball, to be sure, but it respects the integrity of ownership.
This, on the other hand, is the same pattern that gets people hauled in on anti-trust charges. They're not a monopoly (yet), but I have a hard time seeing how this extraordinary claim of ownership in the work of others is anything less than the type of platform-abuse the anti-trust law specifically bans.