I used to be Damus until they got rid of zaps, now I only use primal!
Discussion
This was an Apple requirement. They couldn’t get their cut of the zaps! There is a workaround using emoji comments and then automatically zapping from another webapp but the ux isn’t great. Primal uses nostr:npub1ex7mdykw786qxvmtuls208uyxmn0hse95rfwsarvfde5yg6wy7jq6qvyt9 behind the scenes which I presume gets around the inapp purchase requirements.