/e/OS is an Android OS based on AOSP provided by Google, adopts Android security updates by Google and stops supporting devices when Google stops security updates for the most recent Android version /e/OS can be made of on those devices.
https://en.wikipedia.org/wiki/Android_(operating_system)#Development
https://doc.e.foundation/what-s-e
They can be removed by you, just not with a convenient uninstall button, but with tools provided by … well, make a guess 
… [HOWTO] Uninstall default Apps