THIS MESSAGE MAY CHANGE PERIODICALLY
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Any structure, that of a building or that of a social organisation  was created  or is  running by an engineered program. Engineering being the set of rules applied to matter or living systems is that which is laid beneath anything whatsoever.
When we coin the term engineered we often assume a predetermined design executed  and controlled by the force of the designer engineer.. Engineering  often defined as the application of  knowledge in order to create something. But that definition apply only in the case of an external centralized fixed engineered scheme. The other type,The type that rules in most of nature's behavior and all forms of life is decentralized, and it is rarely  categorized as engineered unless assuming an external force, namely God.  When we come to asses the benefit of a decentralized system we are looking at the operation itself and not at how it was created.  An engineered system can be ruled internally by a small and powerful minority or by a large majority, but only a P2P network can be such that the power to change the design is equally divided between all participant at any given moment,  and the rules of the design can be affected and can evolve as a result of a direct feedback interaction between individuals and their environment Tau- Chain to my understanding is the next step in that direction..not only AI but A-Life, which on its most fundamental level is a decentralized P2P engineered scheme, set to create the most complex network of interaction limited by self destruction and navigated by the forces of both.