apple provides relays for iCloud subscriptions in safari, but they also provide the ability to make any of your network requests use your own MASQUE servers. Not even sure you can use theirs for our purposes.

But yes, damus ios is fully integrated into the apple platform and its dependencies. It’s an ios app. Damus notedeck and android are free from this, but will be able to use the same technique because masque is just a protocol.