From what I’ve seen so far, this is a great family game. Even if young children don’t often have access to mobiles it’s a game you can share with them, go on a Trace hunt together... It can be a great activity for the family.
Coming from Warner Bros we were all expecting a family safe game, but you’re right in that it could make for a fun activity with kids when out for a walk. The Harry Potter universe is good for all ages.