That's kinda the beauty of nostr; even if one client or relay or whatever gets waylaid or blacklisted or just goes down, there are endless other options.

In this case, Apple users can just use a web client and have all the same functionality as Damus used to offer. Also, I heard that there is some kind of 'light client' feature that allows iphones to load apps independently of the app store, which could be an option for people who are wedded to Damus for whatever reason.

As a tangent, I find all nostr clients drain the shit out of my battery and so I never use it on my phone, but if I did, I would just use a web client.