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Android 14 seems to have quietly eliminated a trick some apps were using to keep themselves alive when the OS tried to kill them.
As spotted by Greenify developer Oasis Feng, Android now freezes a package's cgroup before killing it. Control groups (cgroups) is a Linux kernel feature that organizes processes into groups so their resource usage can be monitored/controlled.
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This really was a trick and was mostly exploited.
An app that actually needs being in the background would just show a persistant notification.