Asking a player about a 700-game milestone can feel a little odd. It’s just another round number, a roll into the next hundred. The real benchmark, if you’re fortunate enough to get there, is 1000.

Snapchat announced on Wednesday that Snap Map now has more than 400 million monthly active users, a new milestone for one of the app’s core features. Launched in 2017, Snap Map was originally a way ...