Show HN: I Built an app to Find and track specialty coffee shops worldwide (apps.apple.com)

I built Coffee Zip, an iOS app for finding specialty coffee shops and tracking your visits with a digital passport.

WHAT I'D LOVE FEEDBACK ON

1. Is the passport concept stupid or actually useful/fun? 2. How would you handle user-generated content (shops, reviews) without it turning into spam? 3. Monetization: Ads vs. subscription vs. one-time purchase? 4. Should I build Android or focus on making iOS perfect first?