A good while ago, Apple denied new Damus versions until zaps were removed from notes. There is a slight roundabout way to activate it though: https://damuszap.oxtr.dev. This is a script made by nostr:npub1k92qsr95jcumkpu6dffurkvwwycwa2euvx4fthv78ru7gqqz0nrs2ngfwd that reactivates the zap button on notes.