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I've used the example before of the mixnets used in the Swiss and Aus e-voting systems, where all the Mixnet nodes were operated by the same people - completely subverting the purpose of the mixnet - that is, the point of the mixnet is isolation.

When all nodes are run by the same people, or people who are all connected in some way, then the *potential* to undo the isolation exists - and thus the privacy provided by the mixnet ceases to exist.

Regardless of technical sophistication.