So, if I may summarize this wall-of-evasive-text more succinctly:
As an "experiment" you're going to allow a few "volunteer" SE sites be flooded with the garbage output of a glorified autocomplete, in the hopes that the network's volunteers will curate the mess for you for free, after which your still-unnamed-because-privacy-is-important-for-people-who-give-us-money business partners hoover up the curated data to refine their model.