Some users were just notified about apps that now offer the option to share their in-app purchases and subscriptions.
A new toggle is available in Settings > Apple ID > Subscriptions to let users share eligible subscriptions with family members through iCloud Family Sharing.Not sure if this is an iOS 14.3 feature or not, but nice touch regardless: when a developer enables Family Sharing for subscriptions, you get a notification and you can choose to share it with other family members or not?However, not every app will let you share in-app purchases and subscriptions with the family.