The harder problem is to have beautiful things to discover in the first place. 
If I'd bootstrap an app like this, I would: 
1. scrape pinterest, dribble etc like mad for high quality pics of things that the early nostriches are sure to like (memes, citadel castles, cars, hardware, user interfaces, regenerative ag builds, stable diffusion pics of ostriches, ...)
2. Create some npubs that post these with proper tagging etc
3. Create DVM filters for these topics and set them as the default