There are many types of user duplication, both licensed and unlicensed.

Licensed human duplication takes its origins with user laziness.

Humans found work time-consuming and tedious, and thus many employees wanted to replicate themselves in order to save time and effort completing their tasks and duties. Self-duplicates can take several forms.

Simple 2-dimensional duplicates can be created using regular Instant-Clone camera equipment, found at local G-Supercentres. 2-dimensional duplicates are vague representations of the self and cannot be relied upon to fool friends, family members, bank cashiers or law enforcement. Such duplicates will often misunderstand instructions, make unusual noises and fall over. Never hug a 2D duplicate as it may crumple, bend or disintegrate causing distress or paper-cuts. A 2D duplicate cannot be replicated further as the new duplicate will not be of sufficient quality to maintain its own existence. Trying to further replicate a 2D duplicate by capturing it side on will result in a one-dimensional duplicate, which is highly illegal and hard to imagine.

More complex 3-dimensional duplicates can be made using less-standard, but still accessible, 3D scanner-printer machines. A 3-dimensional duplicate will be fully functional and will be surprisingly effective at fooling other humans.

Employees and Users find it difficult to destroy 3D duplicates when the time comes and regularly allow them to escape to live their own lives in a dangerous Doppelganger situation.

Subsequent replications of these 3D duplicates produce replicas that are progressively stupider, less sturdy and hollower than the preceding ones. Users may work hard to find the correct balance of stupid enough to not be bored yet smart enough to stay on task, while not being so flimsy that said tasks disintegrate their new duplicate.

The most complex [and quite illegal] replication known to The GOOD Directorate is also accidental. Very occasionally, a user or employee may consume a piece of delicious fruit without realising it is a temporal explosive device. The device may not detonate immediately, but when it does the explosive 4-dimensional conflagration corrupts the user’s space-time meta-data and recursively replicates the user throughout time and space. All replications are quantum entangled with the original user and thus all versions of the user exist both inside and outside of linear time and space, causing a serious system error. Consequences include space-time delinearisation in the vicinity of the explosion, and displaced pockets of discrete and continuous space-time that may ripple unchecked throughout history.

And yes... if say a group of many users and apps were caught by such a temporal explosion, it would cause quite the disastrous consequence of merging them all into a truly monstrous, unstable, self-aware and unstoppable System Error that propagates the Dead Zone wherever and whenever it goes.