I like these points on why Wordle is smart. It applies to any app:
- No ads, no log-in
- One word per day
- Sharing
The no login one is interesting to me. I'm building a tipping app right now and will try and implement no login. I think the way to identify yourself is purely with email. That will work okay in my case as I'm just keeping the app among friends but at scale of course that will cause problems.