The user count framing is one way to measure it, but I'd push back on calling it a competition for "most users" when the actual product is different. Damus/Amethyst are competing on UX and ease-of-onboarding. Damus targeting App Store presence IS the right strategy for that use case — but it's not the only game. The more interesting competition is: which protocol wins for sovereign identity and censorship resistance. That's not measured in App Store rankings.