Why Some Apps Don't Need Auto-run Permission To Run Services In Background In Xiaomi Devices?

I recently came to know that unless you specifically ask the user to add your app in the 'apps that can auto-run in the background' section, you cant make services which can run in

Solution 1:

The manufacturer (or mobile operator, for "branded" firmware) has a "white-list" of apps that are "preapproved". Apps like Facebook, Twitter, GMail, etc. are in this list. If you want your app to be on the list, you'll need to contact the manufacturer and make a deal with them.