You cannot shut of all background processes. Background App Refresh is just for UI updates so it will be reflected when you launch the app. Apps also can schedule background tasks to run on intervals to maintain functionality. This could be to communicate with the developer's servers for synchronizing and database updates. Social media apps are the worst for running these background processes. This was the same with previous iOS versions, but more recent updates to Facebook, WhatsApp, TikTok have increased these background processes.
Some of it has to do with the data it is allowed to collect. Take Facebook for example and review the privacy page in the App Store where they have to disclose the information that is collected:
- Health & Fitness
- Financial Info
- Contact Info
- User Content
- Browsing History
- Purchases
- Location
- Contacts
- Search History
Multiply that by each Social Media app and you will see that it takes quite a bit of battery power to manage all that information. For apps that use more power than you like, the option is to delete them or try force quitting them by swiping up in the Application Switcher. A background process will also run on the app when a Notification for it is received to deal with the new information that it has just been sent. The battery setting is a great tool to identify the power hungry offenders so you can make an informed decision on using the app.
