Yes. Unless you indicate in the app that you choose not to participate in a given challenge, automatic actions will be applied to your thermostats. You may choose to withdraw from up to five challenges per winter.
On your first participation in a Hilo challenge, the default settings are as follows.
Morning challenge: Moderate without preheating in bedroom-type rooms; moderate with preheating in other rooms.
Evening challenge: Moderate with preheating in all rooms.
For following challenges (morning or evening), the settings of your most recent challenge will be applied by default. You can change them at your convenience when you receive notification that a challenge will take place.