Assassin’s Creed Mirage will support the iPhone 15 Pro, iPhone 15 Pro Max, iPad Air (M1 Chip or above), and iPad Pro (M1 Chip or above). In terms of compatibility, the iPhone requires iOS 17.0 or later and a device with the A17 Pro chip or later, while the iPad requires iPadOS 17.0 or later and a device with the M1 chip or later.
On the other hand your could consider it paying for Fzero and just ignore the rest of the network. If that works for you then the problem is solved.
On the other hand if you are worried that you will never “own” the battle Royale game: that was never going to happen, it will die when the serves go dark no matter how they monitize. You might as well enjoy it while it lasts.