Backbone One (the controller) does not require the app to work and is great for players of all ages! The controller works inside any game that supports game controllers (Minecraft, Roblox, Apple Arcade games, etc.).
However, much like iMessage, Fortnite, Discord, Houseparty, and most other social apps, the Backbone app requires you to be 13 or older because it is for voice chat and playing with friends. Apple requires users to be 13 or older to use Sign In With Apple and ensure online safety.
Keep in mind that the Backbone One can be used on thousands of controller-compatible games without the app.