Apple can’t stop zaps. They can stop apps from being released in their AppStore but nostr is a protocol, not an app. You can login to #nostr from every browser and #zap with every client that supports zaps. Apple can’t forbid using url’s. Zaps are nothing more than urls being called but instead of https:// they start with something like: lightning://

Good luck stopping text. Add a Lightning Address to your profile and experience the power of #zaps.